Manchester United manager Jose Mourinho admits that everyone at the club, including himself, need to improve if they are to challenge for honours this season.
The Red Devils beat Hull City 2-0 in their English Football League Cup semi-final first leg on Tuesday, but Mourinho wasn't entirely satisfied with the performance at Old Trafford.
United played in front of a muted home support that only found their voice after the opening goal from Juan Mata, but Mourinho believes the performance should inspire more atmosphere.
"Maybe I didn't do my job well to prepare players for the game. Maybe I should bring more tension to the dynamic, preparing the game," he said in the post-match press conference.
"The players have to improve, I have to improve and the fans also have to improve for a big match on Sunday. Today our performance was good enough to win but, on Sunday, we all have to improve.
"I always think we are responsible for the fans' participation in the game. It's our responsibility.
"If we play well and enthusiastically, the fans come on to the pitch. When we don't play so well, and not with emotion and intensity, it's normal for the fans to relax a bit.
"We have amazing fans. When we were not good, they were behind us, pushing us, supporting us.
"What I feel is that Sunday is a special match for us, a special match for Manchester United fans. Don't come to the theatre — come to play with us."