Constantine Hatzidakis has landed himself in a bit of trouble after he elbowed Liverpool defender Andrew Robertson during the clash with Arsenal.
Hatzidakis raised his elbow to the Liverpool defender's throat as the teams left the field at half-time during Sunday's thrilling 2-2 draw with Arsenal at Anfield.
The assistant referee has been taken off duty while the Football Association investigate the incident.
Former Premier League referee Mark Halsey has called for an eight-match ban for Hatzidakis.
But who is Constantine Hatzidakis? And why did he become an assistant referee?