Leeds United may struggle to sell one player in particular this summer even if they really want to. The 49ers have so far made light work of moving players on since the beginning of the window but there is one who could prove to be difficult. Leeds have let go of 12 players in the wake of the play-off final defeat to Southampton in May and that figure is almost certainly set to rise before the end of August. Archie Gray’s £40 million move to Tottenham Hotspur is undoubtedly the most high profile exit so far, while Leeds have done well to shift Marc Roca and Diego Llorente permanently, even if …