Nemanja Vidic has told his team-mates to cut out the defensive lapses that are wrecking their Premier League title campaign.
Defeats for Chelsea and Arsenal on Saturday should have been the start of a perfect weekend for United, who would have moved to within a point of Carlo Ancelotti's men if they had beaten Bolton at the Reebok Stadium on Sunday.
Instead, the problems which are proving so difficult to eradicate reared their heads again.
"It is a big concern that we are conceding so many away goals," said Vidic.
"We have to stop doing it. We cannot let it happen again."