Anderson, Rafael, Nani and Jonny Evans were just four of the players needing treatment after the 4-2 tussle with Derby County - Anderson was carried to the dressing room on a stretcher after everyone else had left the field at the final whistle.
"Anderson will have to go for an X-ray," said a concerned Sir Alex. "There is some damage, we don’t know exactly what. We'll see what happens after the X-ray.
"Jonny Evans has got a recurrence of the ankle injury he’s been holding for quite a few weeks now. Hopefully he’ll be okay in a week’s time.
"Rafael will be out for a few weeks with a hamstring injury.