Manchester United legend Roy Keane had no sympathy for Andy Robertson after he appeared to be nudged by an assistant referee.

At half-time in Liverpool’s clash against Arsenal, the Reds defender closed in on Constantine Hatzidakis.

The latter then appeared to nudge Robertson, leading to furious protests from the Liverpool players to referee Paul Tierney.

A statement from PGMOL read: “PGMOL is aware of an incident involving assistant referee Constantine Hatzidakis and Liverpool defender Andrew Robertson at half-time during Liverpool’s game against Arsenal at Anfield.

“We will look into the matter in full once the game is over.”

by talkSPORT Darren Bent thinks Hatzidakis deserves an eight-match ban for his actions, but Keane didn’t have much sympathy for the Scotland international, telling Robertson to go ahead with the game.

“He should be more worried about his defence,” the former Manchester United midfielder told Sky Sports at half-time.

“Do you know what he is? This Robertson, I looked at it several times. He’s a big baby. It is what it is.

“Just keep playing and focus on your defense. He catches the linesman first.

And the former Premier League referee told talkSPORT that Hatzidakis was struggling: “Officials are the guardians of standards on the pitch, and looking back, I think he will regret his actions.

“To me, Robertson walks up to him and it looks like he’s going to touch him, and then the assistant raises his arm. He shouldn’t have done that.

“What he should have done is go to the referee and report him and let him act, but if he is found guilty of an act of violent conduct, he should receive his punishment in the same way as [Aleksandar] Mitrovic has just taken his punishment.

“You have to watch Mitrovic, don’t you? He was banned for eight games for using technical assault, you could say the deputy technically assaulted a player. You’re looking at two similar incidents, aren’t you?

“It’s something I’ve never seen before and so there’s a first time for everything, but if he’s guilty he has to suffer the consequences…of an eight-game ban because ‘ they set a precedent.”

Tensions between Liverpool and Arsenal were clearly high as both teams work towards their respective goals in the final weeks of the season.

The Gunners took the lead after just eight minutes when Gabriel Martinelli slotted the ball past Alisson.

Gabriel Jesus added his second midway through the first half as Mikel Arteta’s side took control of the game.

Liverpool fell back just before the break through Mohamed Salah.

The Egyptian then had the chance to level the score in the second half with a penalty, but he put his effort wide of the post.

However, with just three minutes remaining, Roberto Firmino made it 2-2 with a header from Trent Alexander-Arnold’s looping cross.

A dramatic clash ended with the points tied, with Arsenal’s lead over City at the top of the Premier League down to just six points.