Managers are fond of saying the January transfer window is a 'difficult market' but it has rarely stopped Premier League clubs from spending big.
Many New Year purchases over the years have been tremendous successes but others haven't turned out to be value for money.
Sportsmail takes a look at the record January buys for each of the current top-flight clubs and how they've worked out.
LIVERPOOL - VIRGIL VAN DIJK
£75million - Signed 2018
The final piece in Jurgen Klopp's jigsaw, van Dijk made an immediate impact at Anfield and has since won every major trophy with the club.