Sir Alex is pleased to have a wide variety of selection options ahead of the match with Fulham at Old Trafford on Monday.
Paul Pogba was substituted during the Reserves' win against Aston Villa because he will be involved against the Cottagers and the manager admits he is still hopeful that the young midfielder will commit his future to the club by signing a new contract.
Several other first-teamers also played at Moss Lane with Phil Jones, Chris Smalling, Tom Cleverley and Fabio all getting valuable minutes under their belts.
"We took Paul off as he will be involved on Monday," stated Sir Alex. "We want him to stay because we think he's going to be a fantastic Manchester United player. We hope that's the case.
"Jones and Smalling have been in and out with injuries and illness. Cleverley, Pogba and Fabio had bits of games. We're only waiting on Nani and Michael Owen now and expect both to start training with us next week."
The Reds know that nothing less than a victory will suffice against the Cottagers as the title race looks like going down to the wire.
"Every game is a must-win game," the boss added. "Hopefully we can keep the momentum going. It's funny how when you come to the crucial part of the season, everyone tends to get fit again. We are delighted with that. It does help your cause without question having a full squad. It gives me variety.
"You have to congratulate the players on achieving the position they are in because of the injuries we've had. It has not been a great season for us in terms of injuries. But the players have shown resilience. They have dug in and they are in the position they are now because of that. Now that we are starting to get players back, it strengthens our chances."