Every team will be looking to strengthen by bringing in new players to replace those leaving the club, which many fans see as misplaced investments.
Someone who has become a victim of spending too much on the wrong players is Louis van Gaal, who was relieved of his job after spending nearly £300m in two seasons.
On the other side of the coin is Leicester City, who famously spent very little on their way to sealing their first ever Premier League title.
Both of these examples highlight that no matter what the cost of a player, it doesn’t guarantee success.
So which teams spent wisely, and which teams wasted their money?
Click the arrow above, right, to see the average transfer cost per first team player fielded for each Premier League club.
Numbers courtesy of CIES Football Observatory