Manchester United boss, Pep Guardiola has said that four players were responsible for the switch in their play as they beat Chelsea 1-0 on Thursday.
Substitutes Jack Grealish and Riyad Mahrez combined in the second half for the only goal of the game.
Guardiola, speaking afterwards, said he was not happy with the “sloppy” first half.
He said: “It was not a good first half, it was sloppy, we didn’t create much.
“Our pressing was so poor, we were not well organised and in the second half with Manu and Rico, with the quality to not just play good, to help others play better.
“The impact in the second half of all four players was so important, they changed the game. In the second half, it was a completely different Man City, a different rhythm. Rico changed his dynamic from minute one.”