Andy Robertson appeared to be struck in the jaw by the assistant referee at half-time of Liverpool's clash with Arsenal.
Linesman Constantine Hatzidakis was heading towards referee Paul Tierney just after he blew up for half-time, carrying the ball with him. Liverpool star Robertson approached Hatzidakis and appeared to grab the official as he walked across the pitch.
Hatzidakis reacted angrily to that though and moved his arm back in what appeared to an elbowing motion towards Robertson's face. The Scotland international was left furious, with Liverpool players surrounding the trio of match officials as they attempted to leave the Anfield pitch.
