England face a nervous wait on the fitness of hooker Jamie George ahead of the Six Nations. George was forced off late in Saracens' 32-24 defeat to Castres on Sunday. He started on the bench and came on as a 55th-minute substitute for fellow England hooker Theo Dan before he limped off late on. Saracens director of rugby Mark McCall said George had hurt his hamstring. England head coach Steve Borthwick will also be keeping a close eye on the medical report out of Northampton Saints. Both scrum-half Alex Mitchell and lock Alex Coles were injured in their 34-32 win over Munster on Saturday. Mitchell is nursing a knee injury while Coles hurt his wrist.