For a list of confirmed transfers, check out the transfers page.
New Fulham boss Rene Meulensteen is lining up a double raid on West Ham for midfielders Ravel Morrison, 20, and Mohamed Diame, 26.
Manchester United are close to agreeing a deal to sign Benfica defender Ezequiel Garay, 27, but they will have to wait until the end of the season.
Arsenal's 30-year-old full-back Bacary Sagna - out of contract at the end of the season - is a £4m target for Roberto Mancini at Turkish club Galatasaray.
Chelsea are vying with Inter Milan for Kurt Zouma, the 19-year-old central defender who has been earmarked as a future France captain by the country's coach Didier Deschamps.
Chelsea boss Jose Mourinho has revealed that the transformation of Eden Hazard from worst trainer to model professional has allowed the club to sanction the sale of winger Kevin de Bruyne, 22, to Wolfsburg.
Reports in France claim Paris St-Germain are contemplating making a bid this month for Chelsea winger Hazard, 23, but Mourinho says he has become so important that his club would not let him go for any amount.
Hull City have launched a £14m double bid to sign Everton forward Nikica Jelavic, 28, and West Bromwich striker Shane Long, 26.
Tigers boss Steve Bruce says he will make no further bids for Long until he gets the go-ahead from new Baggies manager Pepe Mel.
Manchester United are prepared to pay £24m to tempt Germany midfielder Ilkay Gundogan, 23, away from Borussia Dortmund.
Norwich are refusing to allow former manager Paul Lambert to take midfielder Wes Hoolahan, 31, to Aston Villa.
Arsenal have been linked with attacking midfielders Yoann Gourcuff, 27, of Lyon and Juventus's Sebastian Giovinco, 26.
Arsenal are interested in Roma striker Mattia Destro, 22, according to reports in Italy.
Midfielder Michael Essien, 31, could end his Chelsea nightmare by joining AC Milan on loan. "It's true that he could leave Chelsea this winter," said his agent.
Newcastle midfielder Yohan Cabaye, 27, says there is no truth in stories linking him with a move away from St James' Park.
Sunderland manager Gus Poyet has revealed a deal is "very close" to sign Argentine centre-half Santiago Vergini, 25, from Newell's Old Boys.
Manager David Moyes fears his players may not be good enough to halt Manchester United's slide.
Manchester United fear striker Robin van Persie, 30, could be on the sidelines for a further six weeks with a repeat of a thigh injury he suffered at Arsenal.
Scotland midfielder Darren Fletcher, 29, insists there is no dressing room unrest at Manchester United and says the players are buying in to David Moyes's new style.
New West Brom boss Pepe Mel has sensationally threatened to quit at the end of the season - unless he is allowed to bring in his own backroom staff.
Cardiff have posted a £30m loss, taking their debt to £118m with £66m owed to owner Vincent Tan.
Swansea boss Michael Laudrup has ruled out recalling South Korea international Ki Sung-Yueng, 24, from his loan at Sunderland, despite the club's injury crisis.
Under-fire manager Sam Allardyce has vowed he will not walk away from his job at West Ham.
Liverpool striker Luis Suarez, 26, banned for 10 games for biting Chelsea defender Branislav Ivanovic at the end of last season, says he is trying to change his attitude because he knows it was wrong in the past.