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?
Handily, Mail Sport has rounded up the top 10 using data from WhoScored...
10. Dominik Szoboszlai (Liverpool) - 6.97
After scoring three goals and laying on two assists during his spell with Liverpool, Dominik Szoboszlai has hit the ground running despite several injury issues.
As a result, WhoScored have rated him 6.97, a shade under the seven milestone.
9. Kai Havertz (Arsenal) - 6.99
It may have taken him a while to warm up, but Kai Havertz has now found his stride.
He has linked up sharply with his team-mates in recent months and cemented his spot in a red-hot frontline. His nine goals and five assists are an added bonus.
8. James Ward-Prowse (West Ham) - 7.06
A set-piece wizard, James Ward-Prowse has kept West Ham ticking over in midfield as a No 8 and also continued his rich vein of goalscoring form.
His goal against Wolves from a corner kick was his sixth in the league this season.
7. Ross Barkley (Luton) - 7.15
Ross Barkley has been nothing short of sensational for Luton.
After joining on a free transfer, Barkley, an incisive playmaker happy to drop deep, has scored four and completed the fifth-most dribbles (57) in the league.
6. Alexis Mac Allister (Liverpool) -
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