What is the January transfer window?
The January transfer window allows clubs the opportunity to strengthen their squads over a five-week period.
It is their final chance of the season to sign players, with no business to be carried out once the window is closed.
When does it open and close?
Premier League clubs are able to sign new players from Wednesday 1 January.
The transfer window will shut on Monday 3 February, at 23:00 GMT.
What are the transfer window dates of other leagues?
The Bundesliga and Ligue 1 join the Premier League clubs in being able to trade from New Year's Day. The markets in LaLiga, Serie A and Portugal's Primeira Liga open on 2 January.
The closure of the window aligns for most major European leagues, but the exact times on Monday 3 February vary.
Turkey's Super Lig opens on Monday 13 January and stays open until Tuesday 11 February. Clubs in Saudi Arabia can do business from 1 January to 31 January.
Where can I follow all the deals?
You can see EVERY in and out at all of the 20 Premier League clubs this January in our dedicated transfer watch page.
Have there been any deals already?
There have been two January additions confirmed ahead of the official opening of the window.
Tottenham Hotspur have already agreed a deal to sign 18-year-old winger Yang Min-hyeok, who is a South Korea youth international and arrives from Gangwon. Brighton & Hove Albion have announced midfielder Diego Gomez will sign from Inter Miami.
Who are the rumoured signings?
As expected, there is plenty of speculation with supporters keen to know the identity of players on their manager's wish list.
Champions Manchester City could strengthen with a Rodri replacement. Pep Guardiola has confirmed he hopes to sign players in January.
The future of Marcus Rashford is in the spotlight, with new head coach Ruben Amorim leaving the 27-year-old out of Manchester United's recent matchday squads. Could he be on the move in January?
How do deals get done?
Interested in learning the processes behind a transfer? Take a look below at the mechanics of how a deal is completed.
Part 1: What is the deal sheet in transfers?
Part 2: How does a club begin the process of completing a player transfer?
Part 3: What is the Premier League's role in the transfer process?
Part 4: What is FIFA's Transfer Matching System?
Part 5: How does the work-permit process work for transfers?
Part 6: Rules governing the third-party ownership of players
Part 7: Is a fax machine used for transfers?
Part 8: How many loans are allowed by Premier League clubs?
Who are the best January signings in Premier League history?
Traditionally, January is a challenging time to sign great players but we've seen some memorable deals done in the winter window.
Liverpool fans were given a late Christmas present when they agreed a fee with Southampton to sign Virgil van Dijk in late December 2017. The Reds have an excellent record with January transfers, with Luis Suarez and Philippe Coutinho both signing midway through the season.
Other big names to sign for Premier League clubs in January include Man Utd's Bruno Fernandes, former Arsenal forward Pierre-Emerick Aubameyang and five-time Premier League winner Nemanja Vidic.