Premier League spending on transfers in a single season could break the £1bn mark for the first time.
A record £965m was spent in 2014-15, but that total has already been surpassed this season, with the final figure likely to be in excess of £1bn by Monday's 23:00 GMT deadline.
The BBC will bring you extensive coverage of deadline day online and on radio, television and social media.
Live text commentary begins on the BBC Sport website at 07:00 GMT.
Where can you follow deadline day on the BBC?
Our Transfer Deadline Day (TDD) live text commentary gets under way at 07:00 GMT and you can access it from your computer, tablet or mobile via the BBC Sport website or app.
We will bring you the latest news, analysis, gossip and done deals from our reporters around the country and worldwide.
You can also have your say on the potential transfers and signings as they go through. We await plenty of eyewitness reports of Gareth Bale at Manchester Airport...
Our transfers page will capture every confirmed move, while each club page will be updated with the latest transfer stories.
You will be able to follow all the deadline-day deals via the BBC Sport's Twitter account and share your views using #bbcfootball.
There will be regular transfer updates on the BBC's national and regional radio stations.
On BBC Radio 5 live, Mark Chapman will host a deadline-day edition of 5 live Sport from 19:00-23:00 GMT. You can also watch what is going on in the studio on the BBC Red Button.
Chapman will be joined by Joey Barton, Danny Murphy, Jermaine Jenas, Andy Townsend, David Pleat, Mina Rzouki, Rory Smith and Andy Brassell.
Dan Walker will host Football Focus on BBC One from 23:15-23:50 GMT (23:40-00:15 in Wales). Jermaine Jenas, Danny Murphy and journalist Henry Winter will be his guests.
There will also be a special edition of Sportsday on the BBC News Channel from 18:30-19:00 GMT.
And don't forget...
You can read the latest news, listen to BBC Radio 5 live and watch the TV coverage via the BBC Sport app on your smartphone or tablet.
What big deals have been done?
Most of the Premier League deals done in this transfer window have been by teams near the foot of the table.
Newcastle spent £12m on both Jonjo Shelvey and Andros Townsend, while Bournemouth spent £16m in total on strikers Benik Afobe from Wolves and Lewis Grabban from Norwich.
Struggling Sunderland and Norwich have made five signings each, while Southampton and Watford were perhaps thinking about a push for a European place when they brought in Charlie Austin and Nordin Amrabat respectively.
As for Liverpool, their fans will no doubt hope for more arrivals following the on-loan capture of defender Steven Caulker.
Chelsea are the wildcard in the middle. Will Brazil forward Alexandre Pato and USA defender Matt Miazga improve Guus Hiddink's squad? The Blues have already sold Brazil midfielder Ramires to Chinese club Jiangsu Suning for £25m.
Meanwhile, Crystal Palace might have grabbed the freebie of the winter with the signing of former Arsenal, Manchester City and Spurs striker Emmanuel Adebayor.
Teams at the top end have yet to twist. Arsenal spent a modest £5m on Mohamed Elneny from Basel, while Leicester paid Birmingham £3.7m for bright midfield prospect Demarai Gray.
What deals could be done on Monday?
It is make or break day for many clubs during what has been a closely fought Premier League season.
For the sides at the wrong end of the table, there is extra significance, given that £99m is guaranteed for each top-flight club next season as a result of the new £5.1bn TV rights deal.
From Newcastle's bid for West Brom's Saido Berahino to Liverpool's pursuit of Shakhtar Donetsk midfielder Alex Teixeira, BBC Sport's chief football writer Phil McNulty has identified 10 men who could still make a last-minute move.
Stay across the BBC on Monday for news on all the deals and near misses - it promises to be a fascinating day.
When do the windows shut?
Here are the dates and times for when the respective windows will shut across Europe. Odds on a club leaving it too late?
All times GMT:
England - 23:00, Monday, 1 February
Scotland - 00:00, Monday, 1 February
Spain - 23:00, Monday, 1 February
France - 23:00, Monday, 1 February
Italy - 22:00, Monday, 1 February
Germany - 17:00, Tuesday, 2 February
Portugal - Thursday, 4 February