#4 Yerry Mina
Columbia's star at the World Cup, Yerry Mina has been massively underused by the Barca. Mina took off his shoes to walk barefoot on the Camp Nou turf as a sign of respect towards the prestigious club, but that moment is one of a handful of significant times spent by the Colombian on the pitch.
Ever since moving to Barcelona in January of 2018, Mina has only featured in around 370 minutes of football, which averages to just around 50 minutes per month.
News of Valverde's lack of trust in the Colombian's abilities broke out within a week of Mina joining the club.
He has also been treated badly by the fans who consider him as the sole reason behind the defeat against Levante last season which ended Barcelona's unbeaten run in the Spanish League.
The Colombian has drawn interest from several of Europe's top clubs, and reportedly wants to stay in the continent. Also, Lenglet's arrival and Vermaelen's burst of form at about the same time of Mina's arrival make things even worse for the central defender.
An excellent header of the ball, Mina is likely to leave Barcelona this summer, and he must, for the sake of his career. There is little room in the Barcelona defence for Mina to make his mark.