Manchester United defender Patrice Evra has slammed his team's performance in the first half of their 3-2 defeat against Tottenham on Saturday.
Sir Alex Ferguson's team found themselves 2-0 down at the break after goals from Jan Vertonghen and Gareth Bale, with Clint Dempsey's second-half strike, sandwiched between efforts by Nani and Shinji Kagawa, securing three points for the visitors.
Evra insists that United's issue was mental, and not due to tactics or tiredness, and urged his team-mates to return to form against CFR Cluj in the Champions League on Tuesday.
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"We put on the Manchester United face only in the second half against Spurs and this is not enough if we're to win the title," Evra told reporters.
"We must make sure in the Champions League and away at Newcastle we are back to the winning mentality we showed in the second half.
"That's why I say the problem was inside our heads. It was not tactics, it was not tiredness. You don't play a second half like that then make an excuse that you are tired. It's just about your head, we didn't start well in that game."
United have now lost two games in the Premier League this season having also suffered defeat to Everton in their first match of the campaign.
Evra acknowledged that their consistency must improve if they are to claim back the championship from rivals Manchester City in May.
"Two defeats is too much if you want to win the title," he continued. "But we must try to be positive as well. We won at Anfield when they played much better than us. We must forget that first half against Spurs.
"I hope it was just an accident. We were not good enough in the first half and that is what is painful."
The France international believes, however, that United will quickly move back on track if they can reproduce the form they showed in the second half of the contest.
"If you want to talk about the positives then let's make sure we play the way we did in the second half," he concluded. "If we do it'll be tough for anyone to beat us."