Manchester United midfielder Michael Carrick has no doubt they could suffer further humiliation against Shrewsbury on Monday if they do not improve on the Europa League defeat to FC Midtjylland.
The latest poor display of United's increasingly troubled season saw them lose 2-1 to the Danish champions in the first leg of their last-32 tie on Thursday.
United's supporters at the MCH Arena made their feelings about the team's performance known at the end of the match and Carrick has apologised to the fans for the poor showing.
League One side Shrewsbury will secure a place in the quarter-finals of the FA Cup if they can inflict another embarrassing defeat on Louis van Gaal's side and Carrick acknowledges they must improve to avoid another upset.
Three days before they attempt to turn things around in the second leg, United play Shrewsbury in the FA Cup with a quarter-final place up for grabs.
"Monday is a different game but we do need to be so much better than we were on Thursday," he said.
"We know what Monday is going to be - it has been shown many times. It's going to be a tough game.
"And (the Midtjylland match) has shown that if you are not anywhere near your best then you can slip up, so we need to be ready for that.
"If we are at our best then we should win the game, but it is not as easy as that, as Thursday night has shown."
United were beaten 4-0 in the League Cup last season at then-League One side MK Dons and Carrick insisted he and his team-mates will do everything they can to bounce back from their European defeat.
"We're bitterly disappointed, frustrated and angry at the performance, but over the next few days we will get ourselves ready for the games coming up," added Carrick, who will captain the side on Thursday in the absence of the injured Wayne Rooney.
"We have to pick ourselves up and go again - there is no other way."