Manchester United boss Jose Mourinho hear criticism of his defenders after defeat at Manchester City.
Both Victor Lindelof and Luke Shaw were caught out for City's goals, but Mourinho stood by the young pair.
Mourinho said, "I think Victor and Chris had a positive performance.
"A kid (Luke Shaw) that made a mistake for the first goal is playing so, so, so, so well and last season he was playing one match every three months.
"In this moment, he is playing every game for 90 minutes, and when I speak about the physical fatigue, the mental fatigue that leads sometimes to small injuries, other times to mistakes during the game, that's what I mean."