TBF to Rudiger, right up until last season, his injury record has been clean with us. Had no serious injuries for 2 years, excluding the 1 day muscular problem listed on that Transfermarkt site. Just so happened he picked up a knee injury and then Sarri stupidly rushed him back - which aggravated the problem - plus of course, he suddenly got this groin injury. He's already recovered from the knee injury and assuming the groin operation has cleared his problem, then we've got a healthy defender in the squad. Moreover, he's only 26 and is entering his peak. Unless more problems occur (hopefully not!), it would be silly to sell him.