Raheem Sterling and Axel Disasi, two senior Chelsea players, are at the centre of talks between the club and the Professional Footballers’ Association after being frozen out of the first team. The decision has prompted concerns from the players’ union, which is seeking assurances that they can continue to train at a professional standard. Chelsea Disasi //getty imagesWith limited chances of featuring before January, the PFA has stepped in. Chelsea Raheem Sterling //getty imagesAt Chelsea’s training base in Surrey, Sterling and Disasi have been given their own schedules and assigned a coach. Chelsea, sources say, explored several exit options for Sterling this summer, including Bayern Munich and Napoli.