Every professional football club across the globe will soon be looking to sign a player or five to satisfy the fans, the manager and the board.
Sportsmail has previously covered the Premier League clubs' worst ever signings, as well as the 20 best and worst Premier League transfers across the last decade.
Ahead of the January 2021 transfer window, we take a deep dive into the worst transfer windows of all time: from Arsene Wenger to Zinedine Zidane and everything in between.
The odd transfer misstep is understandable - but here we cover the eye-wateringly expensive to the downright shameful transfer windows.