"The idea was to defend with five players" - Maresca spoke on his substitution in 1-2 loss to Man Utd
Chelsea manager Enzo Maresca told BBC Sport: "The red card changed the game after three minutes.
"After the red card for them, 10 v 10, it changed the game for us. We needed to start in a better way.
"It's a red card. [We should have had] a penalty for Joao."
On his subs: "They attack with five players so the idea was to defend with five players. You can defend with four at 11 v 11. The game probably changed after they conceded the red card also with Casemiro. We were much better.
"Cole this morning did a test to play this game. He was not 100%. It was a fantastic effort for the club, for his team-mates, for the team. Unfortunately he was not 100%.
"We need to start the game better. We cannot concede a red card at Old Trafford after three minutes."