After not finding a place in United's line-up, Fosu-Mensah decided to join Bayer Leverkusen.
Fosu-Mensah joined Manchester United from Ajax when Louis Van Gaal was in charge his future looked bright. The Dutch manager used him occasionally including his start in the FA Cup semi-final against Everton. However, after Van Gaal left United, he was not liked by the new manager and was sent on loan.
The Dutch defender has loan spells at Fulham and Crystal Palace which none were productive for him and he eventually returned to United. He was less impressive than he was when he came to United and now Ole Gunnar Solskjaer decided to let him go. Fosu-Mensah joined German side, Bayer Leverkusen with a 3 and a half year contract.
"This is a step into a really interesting, very strong league in which Bayer have been one of the best teams for years," Fosu-Mensah told the club's official website, further confirming he will retain his No.24 shirt from United.
"I'm really looking forward to joining this team. In the past few days I've talked a lot with the coach, and conversations with Simon Rolfes and Rudi Voller have convinced me that there are great prospects in Leverkusen."