Goalkeeper Senne Lammens says Manchester United can't use tiredness as an excuse for their below-par performance at West Ham.
Head Coach Michael Carrick agreed the first-half display in particular was "stodgy".
It lacked the intensity and focus of his previous games in charge, and had it not been for Lammens' excellent late save to deny Callum Wilson and Benjamin Sesko's brilliant equaliser deep into stoppage time, United's unbeaten record in the Premier League, which now stretches to nine games, would have been lost.
It was the first time United have had to play two games in a week since Carrick took over, although West Ham had slightly less time to prepare.
"Just because the last game was three days ago, you can't put excuses on it," said the Belgian international. "They also had a game.
"We have been used to playing one game a week, so you feel it a little bit in the legs I think.
"But if we want to be a team playing for the top, we can't use that as an excuse.
"We weren't that sharp and we need to learn from it.
"We'll play against teams like West Ham in the future and we need to be able to play against them."