Juventus General Manager Jean-Claude Blanc has described Sulley Muntari's winner for Inter Milan as stupid.

"We conceded one of the stupidest goals in the history of football, almost ridiculous, in fact, but we paid a heavy price for it because it was worth the three points," said Blanc.

A flat-footed Alex Manninger watched the ball dribble past him as he called for offside after Ibrahimovic's shot was tapped towards the empty net by Muntari.

The result gives Inter Milan a six point lead over Juventus.