The summer transfer window began once clubs had concluded their final domestic fixture of the 2011 -- 12 season , but many transfers will only officially go through on 1 July .
The majority of player contracts finish on 30 June .
The summer transfer window began once clubs had concluded their final domestic fixture of the 2011 -- 12 season , but many transfers will only officially go through on 1 July because the majority of player contracts finish on 30 June .