#2 Thomas Vermaelen
The Belgian international is one of the strangest buys by the Blaugrana, with his history of injuries. Barcelona bought him in 2014 when he only made seven starts for Arsenal in the 2013/14 Premier League campaign.
Vermaelen made only one La Liga start in his debut season and six in his next. He spent the 2017/18 season at AS Roma and made just 4 starts in Serie A. Though he made 14 La Liga appearances for Barcelona in 2017/18, he was not able to play at his best.
He will be 33 in November and Barcelona cannot rely on him for next season. They need to get rid of him and buy a quality centre-back to support Gerard Pique and Samuel Umtiti. Though they have Yerry Mina to play as a centre-back, they need an experienced defender to compete in Europe.