Mourinho was full of praise for the £30m summer signing after the game.
“We can speak about Eric Bailly, who was playing for Villareal who never played in a derby of this dimension, but was our best player, was the player of the month, and produced a fantastic performance,” said the Portuguese. “He coped with many situations.
“So you never know the way players are going to react, especially when you don’t know them so well. And after only a couple of months it is too early to know them really well.”
Jose Mourinho was talking to manutd.com.