Manchester United manager Jose Mourinho said his players made mistakes in their 3-1 defeat to Manchester City due to the mental pressure of having to play two world class teams in one week.
The Red Devils faced Juventus in Turin on Wednesday evening before travelling across Manchester to play the Premier League champions, but Mourinho did not get the result he wanted at the Etihad.
Goals from David Silva, Sergio Aguero and Ilkay Gundogan cancelled out Anthony Martial's penalty, causing United to lose further ground on the top four.
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Speaking to Sky Sports after the game, Mourinho said: "I think it is not a bad performance at all.