#1 Alex Song
The Cameroonian has had a poor life at Barcelona. Another former Arsenal star, Song was expected to complement Sergio Busquets and Andres Iniesta as the one who broke down attacks and set the team on their way to counter but has failed to make any sort of impact to nail down a starting slot.
After being loaned back to London to West Ham United, Song has yet again proved to be a mistake. The likes of Cheikhou Kouyate and Pedro Obiang have often been preferred over the former Arsenal man possibly outlining his future in the club.
With a contract still with Barcelona, the club are sure to sell him on the cheap to any interested party ending any sort of association. A quality player on his day but his demand for a move to the Camp Nou from Arsenal ended the chance of him actually excelling on the big stage.
Possible replacements: Paul Pogba, Eric Dier and N'Golo Kante.