Michael Carrick, Ryan Giggs and Paul Scholes are all fit to face Newcastle United after missing the Reds' midweek trip to Romania through illness.
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]."