The Reds' number 10 has made just two substitute appearances – against West Bromwich Albion and Wigan Athletic – since his last United start, against Bolton Wanderers, on 26 September.
Rooney spent seven days earlier this month in America in an effort to boost his fitness levels and Sir Alex is now confident his star striker is ready once more to become a permanent Reds fixture.
“The Rangers game is an ideal opportunity in terms of Wayne coming back to the level we know he’s capable of,” Sir Alex said. “I think he needs two or three games. Hopefully he does well. It’s a good game for him. It’s a high-profile match, a terrific pitch, a great stadium, the atmosphere will be fantastic... all of those are positives for anyone of Wayne’s ability.”
Rooney’s primary focus in recent weeks has been to boost his physical fitness. Football training hasn’t been a large part of his regime, but Sir Alex says match sharpness will come with time.
“He had a niggling injury but he came back much better from his week in Oregon. His fitness is good.
“[The time in America] was intense for Wayne. It wasn’t easy; it was difficult. In Oregon it was solid fitness work and hopefully we pick up the football part now. Games will help and we’ll get him back [to the Wayne Rooney we all know] as quickly as we can.”