Manchester United manager Sir Alex Ferguson admitted to being shocked by his side's 4-0 defeat at West Ham United in the Carling Cup quarter-finals.
Two goals apiece from former Red Devils defender Jonathan Spector and Carlton Cole put paid to the visitors, with Ferguson having fielded a much-changed side.
He told MUTV: "I didn't expect that, that's for sure. If you analyse it the goals we gave away were absolutely too soft, they were terrible goals for us.
"The goals killed it. You can't just give goals away at this level.
"Possession-wise we had had the majority of it and we had one or two half-chances and one good opportunity when Obertan's shot was turned on to the post. That was unlucky.
"We were in control of it early in the match and played some good football. I think what changed the game was getting a goal disallowed. It was a break for them.
"It got the crowd up. But the goals we conceded were poor and some of our players were too young to carry those mistakes and still win the match."