Rooney doubtful as van Persie waits for recall
While United are not concerned that Rooney's injury is serious, it is a problem that has troubled him since the turn of the year and Giggs is prepared to nurse the forward through the final three league games.
Rooney (28) is also one of a number of United players struggling to overcome a stomach bug.
"A few of the lads have had a bug," Giggs said. "You have to be careful with the bug because the immune system is down a bit, but Wayne being Wayne wants to play. We will monitor it over the next 24 hours."
Robin van Persie, out of action with a knee injury since mid-March, is in contention for a return.
The Dutch forward had been expected to miss the remainder of United's campaign after being injured against Olympiakos, but Giggs confirmed that the former Arsenal ace was challenging for a place in the squad.
"Robin has been back training this week," Giggs said. "He has looked good. Whether the Sunderland match is too early, we'll just have to see but he has looked really good this week."