United had the opportunity to go up to fifth in the Premier League after Bournemouth dropped points against West Ham, Tottenham were thrashed by Arsenal and arch rivals Liverpool and Manchester City were beaten by Nottingham Forest and Newcastle respectively. Instead they are 10th in the table after 12 matches, level on 18 points with Everton and 11 points off leaders Arsenal.
The Red Devils visit fifth-placed Crystal Palace next Sunday but Amorim was disappointed that they were not energised by the other results on the weekend and performed so sluggishly against Everton.
"It is my responsibility to explain the game, and today, it was not one mistake of one individual, it was the team," said the United boss. "The way we saw the results of the weekend. We should get inside the pitch with a different level of excitement, that is, that is my feeling. It doesn't matter if you are playing well, making good passes, but the feeling and Old Trafford was there, saying we are all here to give a big step up, and I felt that we were not ready again."