Arsenal took the lead against Manchester United on Wednesday night after David de Gea failed to deal with Shkodran Mustafi’s header.

The Spanish goalkeeper palmed the ball into the air above his head and was powerless to prevent it spinning towards the goal as he turned around.

Not even the intervention of Ander Herrera, who was manning the post, could stop Arsenal from getting their noses in front.

The midfielder cleared the ball from behind the line in vain after De Gea’s mishap – and Andre Marriner gave the goal after a quick check of his alert watch.

Fans in the ground will no doubt be questioning the decision given it looked as though Herrera had saved his compatriot’s blushes.

However, these pictures prove the ball was rightly adjudged to have crossed the line in front of the famous Stretford End.

Herrera can clearly be seen making his clearance after the entire ball had crossed the white paint on the Old Trafford pitch following David de Gea‘s mistake.

And a VAR review – which involves officials remotely watching footage to make checks on decisions – would have seen the goal given.

Manchester United weren’t behind for long with Anthony Martial getting his name on the scoresheet four minutes after Mustafi netted.

Although there was an air of controversy around Martial’s strike as well as he was offside when United’s initial free-kick was taken in the build-up.

Arsenal and United went in tied 1-1 at the break in a game which might prove must-win for Jose Mourinho.

The United boss is under pressure following a dismal start to the season which has left his side eighth in the Premier League.

However, Paul Scholes has raised doubts over whether rumoured potential replacement Zinedine Zidane is the man to come in for him, saying: “Is Zidane the right man though?

“He went in to Real Madrid who had a group of ready made winners already.

“This is a totally different job he would have to be rebuild confidence with a squad that isn’t quite performing.

“He went to Real Madrid with so many great players, it was still difficult but, this would be a whole rebuilding job.”