Image source, Getty Images

Elsewhere tonight, Angola have beaten Namibia 3-0 in Bouake, which means they'll play the winners here at the Felix Houphouet-Boigny Stadium in the first quarter-final of the tournament on Friday (17:00 GMT).

Pedro Goncalves' side have won all three of their games since drawing 1-1 with 2019 champions Algeria in their opener, although they had to deal with goalkeeper Neblu's dismissal in the 17th minute of their last-16 match with the score goalless.

You can read our report from that game here.

Image source, Getty Images

Image source, Getty Images

Nigeria went first with their anthem.

Full voices and plenty of passion on the pitch and in the stands.

The players and officials exchange pleasantries. They're ready.

Gabriel Zakuani
Former DR Congo international on BBC Three

Both sides have found it difficult to get through but Nigeria, for me, come into it stronger because of their passage through the group.

Cameroon always have a bit of chaos around them, but it suits them.

I would be happy to be in Nigeria's camp at the moment. They've been missing a lot of chances, which the fans have been moaning about.

But they've been efficient to get the wins.

Ian Williams
BBC Sport Africa at Felix Houphouet-Boigny Stadium

Update: Onana had a spell standing in the wrong half, red top sticking out like a sore thumb surrounded by green-shirted Nigerians as they warm up (in the correct half).

I think he was looking to do some kind of long-range ball collection practice, but none of his team-mates seemed very interested in pumping it upfield to him.

Even when not selected, Onana has a way of catching the eye!

Image source, Getty Images

This will be the 25th meeting between Nigeria and Cameroon across all competitions and their eighth Afcon encounter.

How has the rivalry developed? Who has the better head-to-head record, and what are the fans saying about this last-16 showdown?

Read all about it with BBC Sport Africa' s guide to a game with a history like no other in this competition.

Ian Williams
BBC Sport Africa at Felix Houphouet-Boigny Stadium

With the arrival of the knockout stage, the temperature and humidity inside the Felix Houphouet-Boigny Stadium also appears to have ratcheted up a notch (if that is possible).

Around the edge of the pitch we now have multiple TV crews and bright lights shining on presenters and pundits, with Ivorian legend Didier Drogba receiving a cheer as he arrived to pick up his microphone.

Both sides have been out warming up, although to begin with Andre Onana seemed more interested in dishing out friendly hugs to the three opposition keepers from Nigeria.

Goalkeepers' union, anyone?

Image source, Getty Images

Nigeria make four changes, none of which are surprises: William Troost-Ekong returns as captain, with Alex Iwobi, Zaidu Sanusi and Ademola Lookman also restored.

Kenneth Omeruo, Joe Aribo, Samuel Chukwueze and Bright Osayi-Samuel make way.

Nigeria XI: Nwabali, Aina, Troost-Ekong, Ajayi, Bassey, Zaidu, Onyeka, Iwobi, Lookman, Simon, Osimhen.

Subs: Uzoho (GK), Yusuf, Musa, Aribo, Chukwueze, Osayi, Iheanacho, Onuachu, Awaziem, Omeruo, Moffi, Onyedika.

Image source, Getty Images

There's still no place for Andre Onana between the sticks for Cameroon. The Manchester United goalkeeper's cousin, Fabrice Ondoa, who plays for French third-tier club Nimes, retains his place.

There are two changes from their absurdly dramatic win over The Gambia; Oumar Gonzalez and Moumi Ngamaleu supplant Enzo Tchato and Darlin Yongwa.

Cameroon XI: Ondoa, Castelletto, Wooh, Gonzalez, Ngamaleu, Ntcham, Anguissa, Tolo, Ekambi, N'Koudou, Magri.

Subs: Onana (GK), Moukoudi, Kemen, Vincent, Tchamadeu, Tchato, Yongwa, Neyou, Moumbagma, Elliott, Epassy, Njie.

Image source, Getty Images

The second knockout-stage match of 2023 Afcon is a tantalising one, pitting two of the most successful teams in the history of the tournament against each other.

Cameroon have lifted the title five times, beating three-time champions Nigeria on all three occasions when this game has provided the final - in 1984, 1988 and 2000.

The Super Eagles are the favourites tonight, though, after reaching the last 16 in considerably more straightforward fashion than the Indomitable Lions.

African Footballer of the Year Victor Osimhen's rapid equaliser gave Jose Peseiro's side a point against surprise packages Equatorial Guinea in their opening match, followed by 1-0 wins over hosts Ivory Coast and Guinea-Bissau to finish second in Group A.

Rigobert Song's players drew 1-1 with Guinea, lost 3-1 to holders Senegal and were on the brink of elimination when they fell behind to the lowest-ranked team at the finals, The Gambia, on Tuesday.

Two goals in five minutes - the first a James Gomez own goal, the second the winner by Christopher Wooh - transformed their destiny to send them through in second place in Group C with a 3-2 victory.

Could we see even more drama tonight? It wouldn't be a surprise after a group stage containing an astonishing number of twists, turns and thrills. We'll bring you full live coverage.