United will monitor the fitness and health of Phil Jones and Wayne Rooney over the coming few days after Jones hobbled out of the FA Cup win over Reading and Rooney missed the match altogether.
Sir Alex confirmed to ESPN before the game that Rooney had been struggling with a sinus infection and was "still in his bed", while Jones injured an ankle in a heavy challenge during the first half of the clash with the Royals and was replaced by Nani just before the break.
"We will have to assess it in the morning," the manager told MUTV in reference to Jones' complaint.
"It's an ankle injury so I would imagine he would not be ready for Saturday [away to QPR]. We will see what he is like after that."