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Liverpool are in the Champions League final after an astonishing 4-0 semi-final second-leg win over Barcelona following a remarkable effort from the players, fans and a hidden hero who was pitchside during the most critical moment.

The Reds trailed Barcelona 3-0 following the first-leg hammering at the Camp Nou but Divock Origi made everyone believe the impossible by netting in the first half.

Georginio Wijnaldum's quickfire double after coming off the bench then levelled the tie before one of the most amazing moments in Liverpool 's history.

Trent Alexander-Arnold won a corner down the right-hand side and rather than allow everyone including his own players to set themselves for the corner, he sent in a quick low cross which took the Barcelona defence by surprise but not Origi, who calmly tucked the ball home.

However, this moment was more than just about the clever delivery from Alexander-Arnold as Liverpool legend Graeme Souness explained on Virgin Media Sport. There was also a hidden hero who helped ensure the right-back could take the corner quickly.

(Image: BT Sport)

A Liverpool ballboy provided a key role in the win by ensuring a different ball to the one Alexander-Arnold won the corner with was ushered towards the Reds' defender.

Origi acted quickly seconds earlier to kick the original ball out of play but the ballboy also helped ensure that happened too by standing up and clearly calling for the ball as the screenshot above highlights. This all allowed Alexander-Arnold to provide the corner before Barcelona were fully ready.

Souness was subsequently delighted with the work from the ballboy and told TV viewers that he should be handsomely rewarded by the club.

He said: "Watch this, we will circle him. It goes out for a corner. They are following the ball...watch the ballboy here. He is already on the spot. He puts it down now. He goes to walk away and he realises there is a few dopes gone to sleep.

"They have all turned their back on it. That is criminal, criminal for a professional footballer," Souness added before explaining that the ballboy should be given a season ticket and two Champions League final tickets for the act, as the tweet above shows.

It's safe to say that ballboy is now a Liverpool hero.