For any Welsh fans in need of some reasons to be cheerful, it's worth having a quick look at a few social media channels.
Among the messages, some more serious than others, is a reminder that Armenia have never lost in Croatia.
Sure, it was only one game but it was recent, a 1-1 draw in 2021.
So, you know, that's something, right?
'We have to pick ourselves up'
Wales v Turkey (19:45 GMT)
Wales manager Robert Page expressed disappointment after his side's Euro 2024 qualification hopes suffered a potentially devastating setback with that 1-1 draw in Armenia.
A win on Saturday afternoon would have meant a rather different mood now.
Video content
Video caption: ‘We’re all disappointed, but have to pick ourselves up’‘We’re all disappointed, but have to pick ourselves up’
Wales' task could have been Arda...
Wales v Turkey (19:45 GMT)
Wales know even a victory over group winners Turkey tonight might not be enough to earn automatic qualification for Euro 2024.
But at least they will not have to face the rising star of Turkish football, 18-year-old Arda Guler, again as they seek to keep their hopes alive.
Real Madrid's summer signing scored a stunning goal when Wales lost to Turkey in June, but is out this evening with injury.
"Technically he is a brilliant player," said Cardiff City manager Erol Bulut, who helped nurture Guler at Fenerbahce.
"When I was manager at Fenerbahce, Ardal was 15 and he trained for the first time with the first team.
"At the time he already showed his technical quality, but having technical quality does not mean in three or four years you can go to Real Madrid.
"But he worked hard on himself and developed really well at Fenerbahce. He had many games there in the last few years and showed what quality he has.
"And I think even in Real Madrid he will get his chances and use it well."
Getty ImagesCopyright: Getty Images
Post update
Wales v Turkey (19:45 GMT)
Iwan Roberts
Former Wales striker on BBC Radio Cymru
I think Turkey have picked an inexperienced 11, especially in attack.
There are a few big names not in the team.
I've got a feeling he's put an experimental team together which gives me more hope going into the game.
Wales' play-off safety net
Wales v Turkey (19:45 GMT)
Chris Wathan
BBC Sport Wales
What exactly is the situation for Wales if they don't qualify tonight?
Wales would face either Finland, Ukraine or Iceland in a home play-off semi-final for Euro 2024, should they fail to qualify automatically.
Win that game and they would need to beat either Poland or Estonia in a one-off final to reach next summer's finals.
As we have already mentioned, Rob Page's side can still reach Germany directly if they beat Turkey in Cardiff tonight and Croatia drop points at home to Armenia.
But Wales' Nations League status gives them a play-off place whatever happens this evening.
Results elsewhere in Europe on Monday night confirmed Wales' semi-final options.
If Wales do enter the play-offs, a Uefa draw on Thursday will decide which of the three nations they will face in a single leg semi-final in Cardiff on Thursday, 21 March.
The final would be on Tuesday, 26 March, with the hosts also decided by a draw.
Italy's goalless draw with Ukraine and the Czech Republic's 3-0 win against Moldova saw them both seal qualification on Monday night - meaning Poland and either Wales or Croatia would be the only sides from the top group of Nations League sides not to qualify automatically.
With a minimum of four sides needed for each play-off path, teams from lower Nations League tiers make up the numbers.
It would mean the highest ranked League D side Estonia playing best-ranked League A side Poland, and Wales facing one of the best-ranked runners up from League B not already allocated a play-off place.
Two of Finland, Ukraine and Iceland will remain in their own path, with one moved up.
The new format of play-offs is not new for Wales - they qualified for the 2022 World Cup by beating Austria in a home semi-final before overcoming Ukraine in Cardiff.
In Euro 2024 qualifying, Ukraine finished third in Group C behind England and Italy. Finland, who beat San Marino 2-1 on Sunday, finished third in Group H behind Denmark and Slovenia, above Kazakhstan and Northern Ireland.
Iceland finished fourth in Group J with Luxembourg in third behind qualifiers Portugal and Slovakia.
Getty ImagesCopyright: Getty Images
Page urges Wales to 'end on a high'
Wales v Turkey (19:45 GMT)
Manager Robert Page has urged Wales to end their Euro 2024 qualifying campaign "on a high" tonight.
Saturday's 1-1 draw in Armenia means Wales must beat Group D leaders Turkey in Cardiff and hope Croatia do not win at home to Armenia.
If things do not go their way tonight, Wales will have the back-up option of the play-offs in March.
"Unfortunately it's now out of our control," said Page.
"With a win, we'd all have been buzzing and looking forward to the game on Tuesday and a [further] win would have seen us qualify.
"It's not materialised as we'd like but that's life and we have to get on with it.
"It's about building momentum and, if it's a play-off in March, it's a play-off in March. If results go for us, we've still got an opportunity to qualify [automatically].
"We can only control what we can do, get the players in the right frame of mind, mentally and physically ready for Turkey."
Turkey make eight changes from Saturday’s 3-2 friendly win
over Germany – but this team only shows one change from the side that won in
Croatia in Euro 2024 qualifying last month.
So from that you could surmise that this is their strongest
available team.
Manager Vincenzo Montella is still only three games into his
reign, and he’s won all three.
Wales make three changes from Saturday’s disappointing 1-1 draw
in Armenia.
Tottenham forward Brennan Johnson and, somewhat
surprisingly, Ipswich Town’s Nathan Broadhead are recalled in place of
Bournemouth duo Kieffer Moore and David Brooks.
A third Bournemouth player, centre-back Chris Mepham, is suspended following his yellow card in Yerevan and he is replaced in the line-up
by Luton captain Tom Lockyer.
Uncapped full-backs
Niall Huggins and Jay Dasilva are named as substitutes so, having stayed on the
bench against Armenia, they could make debuts tonight.
Wales: Ward; Lockyer, Rodon, B. Davies; Roberts,
Ampadu, J. James, Williams; Wilson, Broadhead, Johnson.
Good evening and welcome to Cardiff for the final game of Wales' Euro 2024 qualifying campaign.
Consider tonight essentially the series finale to what has been an uneven and eventful show with plenty of ups and downs and twists and turns.
Wales' journey through this group has been impossible to predict - who saw four points against Croatia and only one point against Armenia coming?
Now Wales need a helping hand if they are to ensure qualification tonight, with Saturday's 1-1 draw in Armenia putting them behind second-placed Croatia in the Group D standings.
Wales need to beat group leaders Turkey and hope Armenia can avoid defeat in Croatia.
That seems unlikely, but in this group, who knows?
A happy ending? A cliffhanger climax leading to a March play-off campaign?
Let's see what the script writers have in store for Rob Page's side.
Live Reporting
Michael Pearlman
All times stated are UK
So you're telling me there's a chance?
Wales v Turkey (19:45 GMT)
Dafydd Pritchard
BBC Sport Wales at Cardiff City Stadium
For any Welsh fans in need of some reasons to be cheerful, it's worth having a quick look at a few social media channels.
Among the messages, some more serious than others, is a reminder that Armenia have never lost in Croatia.
Sure, it was only one game but it was recent, a 1-1 draw in 2021.
So, you know, that's something, right?
'We have to pick ourselves up'
Wales v Turkey (19:45 GMT)
Wales manager Robert Page expressed disappointment after his side's Euro 2024 qualification hopes suffered a potentially devastating setback with that 1-1 draw in Armenia.
A win on Saturday afternoon would have meant a rather different mood now.
Video content
Wales' task could have been Arda...
Wales v Turkey (19:45 GMT)
Wales know even a victory over group winners Turkey tonight might not be enough to earn automatic qualification for Euro 2024.
But at least they will not have to face the rising star of Turkish football, 18-year-old Arda Guler, again as they seek to keep their hopes alive.
Real Madrid's summer signing scored a stunning goal when Wales lost to Turkey in June, but is out this evening with injury.
"Technically he is a brilliant player," said Cardiff City manager Erol Bulut, who helped nurture Guler at Fenerbahce.
"When I was manager at Fenerbahce, Ardal was 15 and he trained for the first time with the first team.
"At the time he already showed his technical quality, but having technical quality does not mean in three or four years you can go to Real Madrid.
"But he worked hard on himself and developed really well at Fenerbahce. He had many games there in the last few years and showed what quality he has.
"And I think even in Real Madrid he will get his chances and use it well."
Post update
Wales v Turkey (19:45 GMT)
Iwan Roberts
Former Wales striker on BBC Radio Cymru
I think Turkey have picked an inexperienced 11, especially in attack.
There are a few big names not in the team.
I've got a feeling he's put an experimental team together which gives me more hope going into the game.
Wales' play-off safety net
Wales v Turkey (19:45 GMT)
Chris Wathan
BBC Sport Wales
What exactly is the situation for Wales if they don't qualify tonight?
Wales would face either Finland, Ukraine or Iceland in a home play-off semi-final for Euro 2024, should they fail to qualify automatically.
Win that game and they would need to beat either Poland or Estonia in a one-off final to reach next summer's finals.
As we have already mentioned, Rob Page's side can still reach Germany directly if they beat Turkey in Cardiff tonight and Croatia drop points at home to Armenia.
But Wales' Nations League status gives them a play-off place whatever happens this evening.
Results elsewhere in Europe on Monday night confirmed Wales' semi-final options.
If Wales do enter the play-offs, a Uefa draw on Thursday will decide which of the three nations they will face in a single leg semi-final in Cardiff on Thursday, 21 March.
The final would be on Tuesday, 26 March, with the hosts also decided by a draw.
Italy's goalless draw with Ukraine and the Czech Republic's 3-0 win against Moldova saw them both seal qualification on Monday night - meaning Poland and either Wales or Croatia would be the only sides from the top group of Nations League sides not to qualify automatically.
With a minimum of four sides needed for each play-off path, teams from lower Nations League tiers make up the numbers.
It would mean the highest ranked League D side Estonia playing best-ranked League A side Poland, and Wales facing one of the best-ranked runners up from League B not already allocated a play-off place.
Two of Finland, Ukraine and Iceland will remain in their own path, with one moved up.
The new format of play-offs is not new for Wales - they qualified for the 2022 World Cup by beating Austria in a home semi-final before overcoming Ukraine in Cardiff.
In Euro 2024 qualifying, Ukraine finished third in Group C behind England and Italy. Finland, who beat San Marino 2-1 on Sunday, finished third in Group H behind Denmark and Slovenia, above Kazakhstan and Northern Ireland.
Iceland finished fourth in Group J with Luxembourg in third behind qualifiers Portugal and Slovakia.
Page urges Wales to 'end on a high'
Wales v Turkey (19:45 GMT)
Manager Robert Page has urged Wales to end their Euro 2024 qualifying campaign "on a high" tonight.
Saturday's 1-1 draw in Armenia means Wales must beat Group D leaders Turkey in Cardiff and hope Croatia do not win at home to Armenia.
If things do not go their way tonight, Wales will have the back-up option of the play-offs in March.
"Unfortunately it's now out of our control," said Page.
"With a win, we'd all have been buzzing and looking forward to the game on Tuesday and a [further] win would have seen us qualify.
"It's not materialised as we'd like but that's life and we have to get on with it.
"It's about building momentum and, if it's a play-off in March, it's a play-off in March. If results go for us, we've still got an opportunity to qualify [automatically].
"We can only control what we can do, get the players in the right frame of mind, mentally and physically ready for Turkey."
Read more: Wales must 'end on high' against Turkey - Robert Page
Team news - Turkey revert to strongest side
Wales v Turkey (19:45 GMT)
Dafydd Pritchard
BBC Sport Wales at Cardiff City Stadium
Turkey make eight changes from Saturday’s 3-2 friendly win over Germany – but this team only shows one change from the side that won in Croatia in Euro 2024 qualifying last month.
So from that you could surmise that this is their strongest available team.
Manager Vincenzo Montella is still only three games into his reign, and he’s won all three.
Turkey: Cakir; Kadioglu, Akaydin, Bardakci, Ozkacar; Yuksek, Omur, Ozcan; Sari, Akturkoglu; Yilmaz.
Subs: Gunok, Bayindir, Celic, Soyuncu, Ozdemir, Kahveci, Yazici, Elmali, Kabak, Kutlu, Yildiz, Ayhan.
Team news - Wales make three changes
Wales v Turkey (19:45 GMT)
Dafydd Pritchard
BBC Sport Wales at Cardiff City Stadium
Wales make three changes from Saturday’s disappointing 1-1 draw in Armenia.
Tottenham forward Brennan Johnson and, somewhat surprisingly, Ipswich Town’s Nathan Broadhead are recalled in place of Bournemouth duo Kieffer Moore and David Brooks.
A third Bournemouth player, centre-back Chris Mepham, is suspended following his yellow card in Yerevan and he is replaced in the line-up by Luton captain Tom Lockyer.
Uncapped full-backs Niall Huggins and Jay Dasilva are named as substitutes so, having stayed on the bench against Armenia, they could make debuts tonight.
Wales: Ward; Lockyer, Rodon, B. Davies; Roberts, Ampadu, J. James, Williams; Wilson, Broadhead, Johnson.
Subs: Hennessey, King, Cabango, Huggins, Dasilva, Morrell, Sheehan, D. James, Moore, Bradshaw, Cullen.
Welcome to Wales
Wales v Turkey (19:45 GMT)
Good evening and welcome to Cardiff for the final game of Wales' Euro 2024 qualifying campaign.
Consider tonight essentially the series finale to what has been an uneven and eventful show with plenty of ups and downs and twists and turns.
Wales' journey through this group has been impossible to predict - who saw four points against Croatia and only one point against Armenia coming?
Now Wales need a helping hand if they are to ensure qualification tonight, with Saturday's 1-1 draw in Armenia putting them behind second-placed Croatia in the Group D standings.
Wales need to beat group leaders Turkey and hope Armenia can avoid defeat in Croatia.
That seems unlikely, but in this group, who knows?
A happy ending? A cliffhanger climax leading to a March play-off campaign?
Let's see what the script writers have in store for Rob Page's side.
But first, let's have a look at the team news.