Liverpool left-back Andy Robertson was struck on the face by assistant referee Constantine Hatzidakis in a remarkable incident just after the half-time whistle of Sunday's Premier League clash with Arsenal.
The Scotland captain approached the linesman, who then thrust his elbow into Robertson's chin.
Robertson was then shown a yellow card by referee Paul Tierney as he furiously protested.
Arsenal led 2-1 at half-time, but Liverpool rescued a 2-2 draw as Roberto Firmino's 87th-minute header dented the leaders' bid to win the title for the first time since 2004.
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