Transfer rebels seem to be commonplace in this day and age. They can disrupt your rhythm as a manager, damage confidence inside the dressing room and unsettle supporters.
Liverpool, Swansea, Southampton, Chelsea and Arsenal are among the teams dealing with such transfer issues.
There are a large number of players in dispute with their clubs - Alexis Sanchez, Diego Costa, Gylfi Sigurdsson, Danny Drinkwater, Ross Barkley, Virgil Van Dijk and Philippe Coutinho among them.
Supporters want the strongest team picked on the first day of the season.