I have to disagree. Sigurdsson tracked the player well after his poo header but missed the basics any defending player worth thier salt would have seen & done. Fwiw I'm ex semi pro left back. Firstly the play is outside the box so getting up close is the better thing to do. Giving the player 3ft of space (which isn't standing your man up at that distance) to turn then move across into the box to either play a pass or try to come at you & buy a penalty is bad. You want to get in his space & force the play backwards or outwards or at least keep his vision towards the corner flag & not at options. The attacking player had also not looked up at options or set his body shape up to do anything meaningful yet & Siggy allowed the potential of that to become available by standing off. The attacker was running straight & not facing towards goal yet & Allan could see the mistake Siggy was making so got in there as soon as possible. Cut out the attackers options & you conceed less goals. Sigurdsson was putting the cross or pass or push into the box on a plate for them. Thankfully Allan stopped it from becoming a thing.
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If Sigurdsson was a natural defender I'd agree with you. But he's not and as I said, he has his limitations. If he had rushed out and committed to a tackle he'd probably have been beaten and the attacker is inside our box. The sensible thing is to stand your man up and wait for support. It was decent team work.