Linesman stood down as FA investigate Andy Robertson incident

Assistant referee Constantine Hatzidakis will not officiate in any matches while he is being investigated for an apparent elbow on Liverpool's Andy Robertson.

The incident occurred just after the half-time whistle had been blown during Liverpool's 2-2 draw with Arsenal on Sunday, with Hatzidakis reacting after being confronted by Robertson.

A statement from Premier League referees' body the PGMOL read: "PGMOL will not be appointing Constantine Hatzidakis to fixtures in any of the competitions it serves whilst the FA (Football Association) investigates the incident involving the assistant referee and Liverpool defender Andrew Robertson at Anfield."

Sky Sports cameras zooming in on the confrontation showed Hatzidakis seemingly throwing up his arm and making contact with Robertson, who gesticulated that he had been hit by the official.

An irate Robertson was led away by team-mates but, while he received a yellow card in the aftermath, it is the action of Hatzidakis that will come under further scrutiny.

Keith Hackett, formerly head of the PGMOL, told BBC Radio Five Live: "Ultimately, if he is found guilty of this, his career is in jeopardy.

"I was trying to find an excuse as to why he did it and I came up with, was he in fear? He shouldn't be, because he's in a protected environment with plenty of security.

"But he reacted in a way that he shouldn't have reacted at the end of the day and here we are talking about a match official and not a decision, but an action by a match official - and he's clearly lost his composure."

Another former top-flight referee, Mark Halsey, put the spotlight on Robertson's behaviour and believes a ban is the most likely punishment for Hatzidakis if he is proven to have committed an offence.

Writing in