Sir Alex also revealed at his Friday morning press conference at Carrington that defender Jonny Evans is "okay" after coming off in that win against CFR Cluj.
"It was just a dead leg he picked up last Saturday against Tottenham," he said. "I took him off towards the end [of the Cluj game]."
Chris Smalling has also returned to training (although won't be fit for the trip to Newcastle), which gives the manager a further option at centre-back, while Ashley Young may be fit for United's next home game.
"Smalling has started training on the football side," Sir Alex revealed. "That helps us, particularly as we have a problem at centre-back.
"Ashley will start training while the internationals are on, particularly during the second week. He could, at a stretch, be back for the Stoke game [on Saturday 20 October]."