For a list of confirmed transfers, check out the transfers page.
Liverpool striker Luis Suarez, 26, could still quit the club for Real Madrid or Barcelona next summer despite signing a lucrative contract to stay at Anfield until 2018.
Real Madrid want striker Wayne Rooney, 28, to hold back on signing a new Manchester United contract so they can sign him for a bargain price next summer.
Chelsea boss Jose Mourinho is monitoring six targets - including Rooney - as he bids to strengthen the Blues' title challenge in the January transfer window.
Arsenal manager Arsene Wenger is plotting January moves for Real Madrid's Spanish goalkeeper Iker Casillas, 32, and striker Alvara Morata, 21.
Manchester United left-back Alexander Buttner is nearing the exit door, with Italian sides Genoa and AS Roma interested in signing the Dutchman.
Former England manager Sven-Goran Eriksson is being lined up to replace Malky Mackay as manager of Cardiff City by the club's owner, Vincent Tan.
Netherlands boss Louis van Gaal is top of Tottenham's wanted list to replace Andre Villas-Boas as Tottenham manager.
Spurs rejected an offer from technical director Franco Baldini to resign following Villas-Boas's exit.
Chelsea manager Jose Mourinho has revealed he made contact with Villas-Boas following the former Tottenham manager's sacking.
And Mourinho has reopened a long-running feud with Manuel Pellegrini by mocking the Chilean's Manchester City side for not being Premier League runaway leaders.
Barcelona are keeping an eye on Roberto Martinez as a potential future boss after an impressive start to his reign at Everton.
Arsenal manager Arsene Wenger wants Uefa to scrap the away goals rule from European club competitions.
Chelsea and England left-back Ashley Cole, 33, could call time on his 14-year career after the 2014 World Cup in Brazil.
Southampton's Adam Lallana, 25, believes team-mate and fellow midfielder Morgan Schneiderlin, 24, should be picked to play for England after the latter was overlooked by France.
BBC Radio 5 live announcer Charlotte Green says that one of her dreams when reading the classified football results would be to read out the scoreline 'Forfar 4 East Fife 5'.