Patrice Evra believes United’s footballing principles went AWOL in midweek and he is demanding a return to form against Norwich this weekend.
Basel exposed some alarming holes in the Reds’ defence to claim a 3-3 Champions League draw at Old Trafford on Tuesday.
Sir Alex admitted his players were "too cavalier" against the Swiss outfit and Evra agrees, stating that a return to United’s usual discipline and work ethic will mitigate the spate of injuries at the back.
Evra explained: "It’s been difficult [having a changing back four], but when you play for Manchester United you can’t look for excuses.
"It’s a responsibility for everyone – not only the defenders and the goalkeeper, but the midfielders and the strikers as well. We have to press more like we did in the first few games and not let other teams have time to play.
"When they come to Old Trafford they have to be scared and know they will not enjoy their football and they will find it hard.
"It’s not difficult to get the balance right [of attacking and defending]. None of our games have been easy, but we made them look easy at the beginning of the season because we worked hard, we were compact and everything about our shape was right.
"I think if we just go back to that we’re going to resolve the problem. It’s not a disaster, it’s just a good warning and a wake-up call.
"We are beautiful when we make the game easy, but we can be ugly if we don’t make the effort and do what we need to do! We have to make sure on Saturday we defend like a team, stay compact and try to keep a clean sheet."