1. Neymar
Neymar became the highest paid transfer fee ever when his €222 million fee, which more than doubled the reigning record at the time, went through from Barcelona to PSG.
The winger no longer wanted to play in the shadow of Lionel Messi, but few could have anticipated such a high price for him.
A €57.1 million move to Barcelona from Santos in 2013 saw Neymar quickly rise to one of the best players on the planet. Scoring a total of 105 goals in 186 appearances for Barcelona, Neymar won two La Liga titles and one Champions League - in the 2014/15 season - which saw Neymar end in third place in the Ballon d'Or voting in 2015.
In his first year with PSG Neymar scored 28 goals in 30 appearances, leading PSG to a dominate title in Ligue 1, before his season ended early through injury.