Sir Alex Ferguson felt Heurelho Gomes 'should know better' following Manchester United's disputed second goal in the 2-0 home win over Tottenham Hotspur.
United were leading through captain Nemanja Vidic's first-half header when Nani scored a decisive second for the hosts five minutes from time.
Nani rolled a shot into the net after Spurs keeper Gomes had thrown the ball onto the ground believing a free-kick had been awarded after the United winger had handled in the box.
However, referee Mark Clattenburg was waving play on and allowed the goal to stand after consulting his assistant, much to Spurs' fury.
Ferguson felt Nani should have been awarded a penalty in the build-up to the incident and suggested it was an error from Gomes, rather than a mistake by the officials.
"It was bizarre," said the United manager. "No-one knew at the time what was wrong. One minute the goalkeeper had the ball in his hands and next it's in his net.
"Nani looked back and looked at the referee and the referee said play on, so what can he do but put the ball in the net.
"You can look at the referee and look at the linesmen and blame them, but the goalkeeper should know better. He's an experienced goalkeeper. I thought he made a mess of it.
"I thought it was a penalty first of all and I think Nani felt he handled the ball. But the referee didn't blow for it.
"The referee played on because the goalkeeper took possession of the ball. He then went to take a free-kick thinking it was a foul. He made an error."