The referee overruled the linesman and disallowed the goal leading to protests which halted the game for several minutes.
The linesman says the ball had earlier gone out of play, which is frankly tosh.
Drury went down under Muirhead's tackle from behind and after some frantic flag-waving from the linesman , the referee gave the penalty.
Both referee Dunn and his linesman missed the contact and Henry was furious.
Gerrard's just been fouled making for the penalty area, but the referee and the linesman are having none of it.
But as he gallops towards the Aussie goal with the ball at his feet, the linesman waves his flag.
Under advice from the linesman , the referee awards a free-kick to AC Milan about 40 yards out for no apparent reason.
He was offside, says the linesman , and for once in this tournament, the replay agrees.
The experienced official calmly walked over to his far side linesman and consulted him before pointing to the half-way line and sending the Dundee fans into raptures.
Although the referee ruled that he had got the ball down, the linesman - who was further away - gave a double movement.