Transfer spending by Premier League clubs in January increased from last year after two big deals were confirmed on the penultimate day of the winter window.
Manchester United have completed the biggest deal so far, signing Portuguese midfielder Bruno Fernandes from Sporting Lisbon for £47m, while Sheffield United brought in Norwegian midfielder Sander Berge from Belgian side Genk for a club record fee, reported to be £22m.
With just one day remaining, the total outlay by top-flight clubs stands at £185.1m, an increase from the £180m spent last year, but a long way off the £430m record from 2018.
Clubs across Europe, including in England and Scotland, cannot sign players after Friday, 31 January.
For Premier League and English Football League clubs the deadline is 23:00 GMT – with Scotland’s at midnight.
Some reported transfers include Manchester United’s pursuit of a striker – with Dalian Yifang striker Salomon Rondon being considered – and Arsenal’s links with Atletico Madrid winger Thomas Lemar.
You can follow live updates throughout the day here.
What else do you need to know about deadline day?
Can deals be completed after the deadline?
In the Premier League, clubs completing deals late on deadline day will be able to submit a ‘deal sheet’ between 21:00 and 23:00 GMT in order to give them more time to complete a transfer.
Clubs will then have until midnight on 31 January to complete the information required by Fifa’s transfer matching system to apply for international clearance for new signings.
What about loans and out-of-contract players?
Clubs can sign free agents after the deadline – at any stage of the season – so long as they left their previous club before the transfer deadline.
No loan signings can be made by EFL or Premier League clubs after the deadline, except in extreme circumstances – such as a club’s senior goalkeepers all being unavailable.
How about other countries?
The transfer deadline is on Friday in all of Europe’s major leagues. German Bundesliga clubs have until 17:00 GMT, with Italy’s deadline at 19:00 GMT and France and Spain’s windows closing at 23:00 GMT.
When can new signings play?
New players can only feature in this weekend’s games if they are signed and registered by 12:00 GMT on Friday. Otherwise they will have to wait for the following round of Premier League matches, which is split over the next two weekends.
Nobody can play in next week’s FA Cup replays if they were not at the club for the initial fixture.
What are the biggest deals of this window so far?
United’s signing of Fernandes has been, by far, the biggest deal up until now.
Spurs have made the loan signing of Real Betis midfielder Giovani lo Celso permanent for a fee of £27.2m and added forward Steven Bergwijn for £27m from PSV Eindhoven, after selling Christian Eriksen to Inter Milan for £16.9m.
As mentioned, the Blades signed Berge for a reported £22m, Wolves have spent a reported £16.9m on Portuguese winger Daniel Podence from Olympiakos and Aston Villa spent £10m on Genk striker Mbwana Samatta.
Elsewhere, Real Madrid spent £26m on Flamengo youngster Reinier Jesus and Borussia Dortmund bought Red Bull Salzburg wonderkid Erling Braut Haaland for £17m.
What are the biggest January deals ever?
The two biggest January transfers ever happened in 2018 and both involved Liverpool.
They sold Philippe Coutinho to Barcelona for a fee which could yet rise to £142m and spent £75m on Southampton centre-back Virgil van Dijk.
The next biggest January signings by English clubs have been Chelsea’s £58m recruitment of Borussia Dortmund winger Christian Pulisic last year – although he stayed with Dortmund on loan – and Manchester City buying Athletic Bilbao defender Aymeric Laporte for £57m in 2018.
Where can I find latest transfer news and gossip, and follow deadline day?
BBC Sport will guide you through all of the moves on the big day. Our live transfers page will be up and running from 06:30 GMT, while BBC Radio 5 Live will bring you all the latest deals, rumours and news.
And every confirmed transfer will be on our list.
There will be the usual analysis and reaction from BBC Sport’s pundits and experts and all the best of social media.