Rasmus Hojlund arrived with the Manchester United squad at the Etihad Stadium but was missed during the derby defeat to City.
The Denmark international won his first club Player of the Month award at the weekend after a fabulous February that featured five goals in four games, before an injury brought a halt to his hot scoring streak.
It is hoped last summer's signing will be back in action soon, with the initial diagnosis that he would be out for two to three weeks. The muscle problem has cause him to sit out the games against Fulham, Nottingham Forest and City.