Man United manager Erik ten Hag warns young Omari Forson he would have been sent off had the VAR reviewed his furious sacking of Julian Ryerson in the Las Vegas friendly defeat by Borussia Dortmund

Erik ten Hag told youthful Manchester United winger Omari Forson he would have been sent off against Borussia Dortmund in Las Vegas had there been a VAR at the game.

Ten Hag replaced Forson 38 minutes after United’s 3-2 defeat by the Bundesliga side at Allegiant Stadium after becoming involved in a conflict with defender Julian Ryerson.

Forson furiously kicked Ryerson and was then booked for an attack on Karim Adeyemi, who stepped in to defend his teammate.

Ten Hag immediately told Antony to warm up and sent on the Brazil star for Forson when his argument with Ryerson threatened to escalate.

The 19-year-old winner looked dejected when he was substituted before half-time and was comforted by Scott McTominay and Christian Eriksen as he walked to the touchline where Ten Hag was waiting to teach the youngster a lesson.

Erik ten Hag has warned youngster Omari Forson he is at risk of being sent off in a competitive game with VAR after he sacked Borussia Dortmund’s Julian Ryerson

The United manager took Forson off early after the clash and spoke to him on the touchline

“If there is a VAR, he will be sent off,” said the Dutchman. “He played a good game and the opponents are angry with him, so that’s a learning curve, but don’t take matters into your own hands.”

“You can’t be the referee, you have to play football, you have to beat your opponent, you have to score and that’s the best way to react.”

United started with a weak side and took the lead through a superb Diogo Dalot goal.

However, they conceded two goals against Donyell Malen with 18 seconds remaining and although Antony equalized early in the second half, Youssoufa Moukoko punished the weak defense with a late winner.

Ten Hag, who substituted several regular players after the hour, described the capitulation as “unforgivable”.

He then held off the team longer than expected before the team flew back to Manchester from Las Vegas after losing three of their four games on tour.

“There are no excuses,” he added. “We definitely have to perform and then you have to be merciless and win games because we are Man United and the fans expect us to win.”

“I said to the team, ‘I think it was a good Tour but you want to finish with a good performance and you only see 60 minutes where I was happy but not with the goals we conceded because they were really bad.”

Forson on the ball during United’s 3-2 loss to Borussia Dortmund in their last friendly

Youssoufa Moukoko scored the winning goal as Borussia Dortmund beat Manchester United

Diogo Dalot (centre) gave United the lead with an impressive long-range shot

But two quick goals from Donyell Malen before half-time turned the game around for Dortmund

“The first goal was really bad in defense and the second really bad in construction and that’s not us.” We have to stay in control and keep the responsibility on the ball. That’s how it was with Dortmund 3-2, so that can’t happen and it’s unforgivable even if it’s a friendly.

“We showed a good performance, played as a team, lots of momentum and good pressing, so it was really fun to see that.” I wanted to say that to the team at half-time and then suddenly they conceded two goals and that were really gifts.

“It was annoying, but the last half hour was bad, a bad performance.” place and that was not good at all.”