Jose Mourinho believes referee Chris Foy’s performance in the defeat at Aston Villa could cost Chelsea the title.

Premier League leaders Chelsea, who play Crystal Palace on Saturday, lost 1-0 at Villa Park in a match which saw Mourinho sent to the stands following the dismissals of Willian and Ramires.

Mourinho maintains Manchester City are title favourites and Liverpool have a strong chance, while he refused to rule out Arsenal despite hammering the Gunners 6-0 last weekend.