The physios job is to get the injured players fit on time. And they have been brilliant at that most players are getting back early.
Injury rates down to freak injuries like debuchy, giroud and ozil are nothing to do with the medical staff. Injuries from playing players into the red are the managers fault. And training injuries are the coaches fault. The fitness coaches manage the training schedule if they over train them thats not the physios fault.
From memory theos the only player that's had any kind of setback during rehab but he's always been made of glass. And he was back in the team when he had the set back. And prob practicing sprints after training.