Premier League clubs splash the cash every window in the hope of snapping up some of the world's best players - with hundreds of millions, if not billions, spent.
Routinely, the likes of Manchester United, Manchester City, Chelsea and Liverpool will pounce to seal eye-catching signings in their bid to dominate the league.
This is easier said than done, of course, and often it is the moves that sneak under the radar somewhat that prove to be the most effective and best value for money.
But who is the best signing of the season according to the cold, hard statistics?