Late deals: Slimani to Newcastle, Sorloth to Palace, Hugill to West Ham, Andy King to Swansea
Riyad Mahrez staying at Leicester despite Man City interest
Swansea sign Andre Ayew from West Ham for cub-record £18m
Stoke sign Badou Ndiaye for £14m
Arsenal sign Pierre-Emerick Aubameyang for £56m
Olivier Giroud joins Chelsea from Gunners; Spurs sign Moura
Dortmund sign Chelsea's Michy Batshuayi on loan
Your club's January window in gifs - use #bbcdeadlineday
Transfer window shuts at 23:00 GMT in England, midnight in Scotland
Simon Stone
BBC Sport
It's all go now. Across north London...
Lucas Moura has completed his medical ahead of his move from Paris St-Germain to Tottenham.
The 25-year-old Brazilian has agreed a £25m transfer and will become the fifth most expensive player in the club’s history.
Arsenal
We've run some of this month's transfer dealings through the SAM (Sports Analytics Machine), the super-computer built by Ian McHale, professor of sports analytics at the University of Liverpool.
Here's what it made of Arsenal's very protracted pursuit of Pierre-Emerick Aubameyang...
Image source, Getty ImagesArsenal signing Aubameyang will increase Arsenal's probability of finishing in the top four by 2% (up to 20%) and would bring an expected increase in points of around 0.6.
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Aubameyang is an Arsenal player at last...
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Arsenal
Arsene Wenger does love a fox in the box and that's certainly what Pierre-Emerick Aubameyang is.
He scored 98 goals in the Bundesliga with 97 of those coming from inside the area.
Image source, Opta#bbcdeadlineday or text 81111 (UK only)
Callum: Ok Arsene, now go in big for Evans and keep Giroud. Thanks, everyone.
Rob: Wenger will probably put him in goal.
Mac: As an Arsenal fan, it doesn't matter who we buy. If Wenger is still at the helm, we are doomed - if he trained a fish, it would drown.
John Hill: No Champions League, no prospect of winning anything, how do Arsenal do it?
"Yo, Pierre. You wanna come over here?"
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Borussia Dortmund have tweeted their thanks to Aubameyang who scored 98 goals 144 Bundesliga games for the club.
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Image source, Arsenal FCArsenal said in a statement:, external "Pierre-Emerick Aubameyang has joined us from Borussia Dortmund on a long-term contract for a club-record fee.
"Our second signing of the January transfer window, the 28-year-old is one of the world’s most highly-rated strikers. He scored 98 goals in 144 Bundesliga games for Dortmund and had a hand in 172 goals in 213 matches in all competitions for his former club.
"That works out at an average of 96 minutes per goal or assist.
"Auba is the Gabon captain and all-time top goalscorer, and became the first Gabonese winner of the African Footballer of the Year award in 2015.
"This deal is subject to the completion of regulatory processes and Auba’s squad number will be confirmed shortly."
It's official.
Arsenal confirm the signing of striker Pierre-Emerick Aubameyang from Borussia Dortmund for a club-record £56m fee.
On the departure of Pierre-Emerick Aubameyang to Arsenal, Borussia Dortmund sporting director Michael Zorc said: "Apart from the unpleasant events of recent weeks, we like to remember that the story of Pierre-Emerick Aubameyang at BVB for more than four years was a single success story.
"He has done great things for Borussia Dortmund at this time, scored many important goals and is part of the team that brought the DFB Cup to Dortmund in 2017. We wish Pierre-Emerick all the best for his future at Arsenal. "
Finally some action.
Borussia Dortmund have released a statement, external saying they have reached an agreement to sell striker Pierre-Emerick Aubameyang to Arsenal for £56m.
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There really isn't a lot of optimism coming from Newcastle fans at the moment...
Rate your club's January business with a gif!
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So, very little to report this morning, don't know where we would be without your gif contributions.
The biggest news of the morning saw an agreement reached for Chelsea striker Michy Batshuayi to join Borussia Dortmund on loan.
We are still waiting on Arsenal's signing of Pierre-Emerick Aubameyang and Chelsea bringing in Olivier Giroud.
The Riyad Mahrez to Manchester City chat has gone cold too, no update on that so far.
Things picked up in that last hour, we had an actual signing. #Scenes.
The transfer window in England shuts at 23:00 GMT and at midnight in Scotland.
Owen Phillips
BBC Sport Online
There could a fair bit of movement in the East Midlands today. As well as the "will he, won't he” Riyad Mahrez shenanigans at Leicester City, Nottingham Forest are likely to be busy.
They signed centre-half Tobias Figueiredo last night and are still trying to fend off interest from Burnley for popular defender Joe Worrall, having already rejected a deal totalling around £12m.
A goalkeeper is still believed to be very much on the agenda, with giant Watford man Costel Pantilimon, once of Manchester City, being strongly linked.
And could former Fulham striker Ashkan Dejagah be another new City Ground, external arrival?
Down the A52, Derby are pretty top heavy up front but would still be keen to bring in another attacker if Johnny Russell departs.
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Is another kind of switch on the cards for Riyad Mahrez?
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Dafydd Pritchard
BBC Sport Wales
Swansea City are still hopeful of signing former forward Andre Ayew from West Ham and winger Lazar Markovic from Liverpool.
The Swans might have to break their transfer record to re-sign Ayew, having had a bid of £14m rejected by the Hammers, who want something closer to the £20m they paid for him in 2016.
Swansea midfielder Ki Sung-yueng has ruled out moving to West Ham as part of the deal.
As for Markovic, the Swans would like to sign the Serb on loan but Liverpool would prefer to sell him permanently.
One player who will not be joining the Welsh club is Everton striker Sandro. There had been interest but the Spaniard has opted to join Sevilla on loan.
Swansea City
Some news from south Wales now - Ki Sung-yueng has told Swansea he does not want to leave the club in the January transfer window and is determined to help them stay in the Premier League.
The South Korea midfielder, 29, is wanted by West Ham as part of a deal that could bring Ghana forward Andre Ayew back to the Liberty Stadium.
But Swansea are reluctant for Ki to leave, as is the player himself.
"If Swansea want me to stay, I want to stay in the team so I can help stay in the Premier League," Ki said.
"That's my target and my decision.
Leicester City
You could say the best transfer Leicester made this year was outside the window when we brought in Claude Puel as manager. Craig Shakespeare’s replacement has transformed a team struggling to stay outside the relegation zone into serious European contenders.
Adrien Silva looks a mainstay and Fousseni Diabate, a £2m buy from the French leagues (ala Kante and Mahrez) made an impressive debut in the Cup against Peterborough.
Image source, Getty ImagesWith long term servant Andy King and record buy Islam Slimani being linked with moves away and Puel’s liking for young academy players being given a chance looks like our window may see more go out than come in.The one player that I would like to see arrive is Micheal Keane from Everton who seems surplus to requirements .
Chris Forryan, Leicester till I die
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Agreed.
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