Transfer Deadline Day: Premier League's record transfers
BBC Sport looks back at the most expensive transfers in Premier League history.
Arsenal smashed their club transfer record with the £42.4m capture of Mesut Ozil from Real Madrid in 2013, while Manchester United made Juan Mata the most expensive player in the club's history when they paid Chelsea £37.1m earlier this month.
Chelsea's Fernando Torres holds the title as the most expensive player ever signed by a Premier League club - will his £50m fee be surpassed in this transfer window?
The transfer window closes at 23:00 GMT on Friday 31 January, and you can follow the latest developments across BBC Sport.