The Netherlands international last played for the Reds in January, against FCSB in the Europa League, before heading out on loan to PSV Eindhoven for the second part of last season.
After proving his fitness, Malacia was named on the bench for the home game against Brighton & Hove Albion on Saturday.
"I love all my players," the head coach told MUTV. "I demand the same thing from all the players.
"He is working really well, he adapted really well to our team. For me, there are no favourites.
"If you work, you play for Manchester United.