Transfer news: The biggest January transfers so far - in pictures

The main activity in this transfer window

David Moyes (left) poses with Juan Mata on Monday

The January transfer window is often a frantic period for clubs as they rush to reinforce their squads for the crucial months ahead.

Panic buys and clever moves are the name of the game as managers try to make that decisive transfer that can alter the course of their season.

Clubs at the bottom end of the table are trying to find those key signings that will help them avoid the dreaded drop.

While those nearer the top hope they can find the man to give them that little bit extra in their pursuit of glory.

To see who the biggest transfers of this January window have been, look at the gallery below...