I think the medical team will know it better than us. He is just 25, it really would need to be something chronical to never get full fit again. Even if our medical team would say, that he need a surgery and would be out for some months, i would take him. But i still can't believe, that Barca will sell him in summer. And we surely wouldn't be the only potential buyer (maybe Juve, United, PSG, Liverpool?).