Rooney missed the win over Stoke on Tuesday, due to an ankle injury that he sustained against West Brom on New Year’s Day.
Rooney returned to the field against West Brom after first limping off.
“If it had been serious Wayne would not have come back on last week,” said Ferguson.
“Maybe it was not the right thing to do in terms of getting him ready for Tuesday’s game. But he started work yesterday and we just hope that he will be all right for Sunday.”
