Aston Villa cruised into the quarter-finals of the Europa Conference League after a 4-0 second-leg win over Ajax, but it might have come at a cost – with star striker Ollie Watkins picking up an injury. Watkins has been on fire. Thursday had been a good day for him, retaining his England place ahead of friendlies against Belgium and Brazil. He then got his name on the score sheet, his 22nd this season. But, he limped off in the first half after taking a whack to the knee. Unai Emery said after the match that he could still be in contention to play for Villa against West Ham in the Premier Leag…