#3 Thomas Vermaelen
Thomas Vermaelen was seen as a smart investment when he moved to the side from English giants, Arsenal, for a relatively modest €19 million in 2014. The Belgian international has been a flop since he joined the Catalans. Even though he won the quintuple last season, his time at the Camp Nou has been freckled.
The former Arsenal captain is thirty and isn't seen as the kind of centre-back who is capable of partnering Gerard Pique in the near future. The Belgian has suffered multiple injuries since joining the club and will do well with a move away from the spotlight to focus on the few years he has remaining in his career.
Vermaelen's exit from the first-team squad is surely going to force the club to sign a replacement but a ball-playing non-injured one at that. There aren't too many ball-playing defenders in the game but that isn't an excuse to keep the Belgian in the squad.
Possible replacements: Mats Hummels, Neven Subotic and Marquinhos.