Manchester United manager Louis van Gaal has conceded that his side's showing in Saturday's 0-0 draw with Crystal Palace provided reason for worry.
United have now failed to score in 325 minutes, with last weekend's Manchester derby draw, a midweek Capital One Cup defeat to Middlesbrough on penalties, and Saturday's clash with Palace all ending without a goal scored.
On Saturday, the Red Devils managed just five shots on goal, of which just one was on target, as they were outplayed by Alan Pardew's side. United could consider themselves lucky to leave Selhurst Park with a point, and Van Gaal admitted that he was not impressed by his side's performance.
"We were not the better team today and that's a concern," Van Gaal said after the match.
He added: "When you are not creating so many chances you cannot complain. Against Middlesbrough, I thought we had chances to finish, so that is of more concern. But today we had no chances to win it."
The travelling United fans made no secret of their feelings, chanting "attack, attack, attack", and Van Gaal acknowledged that the fans had reason to demand more, but insisted that for the most part his side has been performing well.
He said: "The fans have the right to say that, but other than Arsenal [where United lost 3-0 on Oct. 4], it's the first time we have not been the better team. They have seen that, I think. Maybe in the next match they will sing in another way."