• Ramires appeared to be injured when struck by the ball• Brazilian could miss Champions League tie against NapoliRamires may be out "for at least four weeks at least" due to a medial knee ligament injury suffered during the second half of Chelsea's FA Cup fourth-round victory at Queens Park Rangers.The injury appeared to happen when the ball hit the Brazilian midfielder's leg. After lengthy treatment by club medical staff he was carried off on a stretcher.If he is out a month, he could miss at least four Premier League games and the last-16 round of the Champions League when it resumes next month.André Villas-Boas, the Chelsea manager, said:...