"I have said before, he can play on. I don't think he has the same issue with his back that he had a couple of years ago. It is manageable now. That is the important thing."
Jonny Evans' form has ensured he has been impossible to leave out of late and the Northern Irishman continues to attract praise from his manager.
"He is the future," said Sir Alex. "Nemanja [Vidic] and Rio know that. There is no doubt. His form is improving all the time. I think his experience helps. As he matures and gets experience year-by-year, he is getting better. There is no end to his improvement. He looks as if he is improving all the time. That, for us, is a great sign."