Compared to its summer counterpart, the winter transfer window may not have the same major moves happening.
However, it provides clubs with a much-needed chance to reinforce their squads in order to make a run to win their league, qualify for a European Cup or escape relegation.
The biggest move that has happened to date involved Brazilian starlet Lucas Moura, who completed a €40 million move from Sao Paulo to Paris Saint-Germain on the first day of the transfer window.
Despite the hefty price tag, this move will ultimately prove to be the biggest steal of this winter transfer window. Here are five reasons why.