"Danny did a good job for us and you can see the ability he's got," said the boss in an interview with MUTV.
"He's still growing and can get a bit weak at some moments during games, but overall we're very pleased with him.
"It was good for him to experience playing away from home because it's always more difficult," added Sir Alex. "He showed a good temperament to play.
"He's got a good personality, he always enjoys playing. The potential is definitely there."