Video assistant referees came into use at the Under 20s World Cup as they dismissed Argentina forward Lautaro Martinez against England.

The referee Mohammed Abdullah Hassan decided to consult with the panel of assistants watching screens on the side of the pitch after a seemingly innocuous challenge in the 75th minute.

When the replay was analysed at the Jeonju World Cup Stadium, it showed that Martinez had left a trailing elbow on Chelsea starlet Fikayo Tomori.

Mohammed Abdullah Hassan decided to speak to the VAR assistants on Saturday morning

Hassan gestures to show that he is set to consult the VARs during the game in Jeonju

A seemingly innocuous incident required further analysis by the referee and his team

Hassan then called over Argentina forward Lautaro Martinez to show him a card

And Hassan and VAR decided that it was worthy of a straight red card, which he presented to the Racing Club star after around a minute of deliberation.

It seemed a slightly controversial decision. The replay showed an elbow connected but it was difficult to note any intent from Martinez.

VAR will be used throughout the competition, with additional officials to be used to support any 'match-changing' decisions, such as goals, penalty decisions, red cards and cases of mistaken identity.

The system involves both referees and VARs deciding whether an incident should be reviewed. It is then watched back and a decision is taken by a combination of both or just based on the VARs' information.

The replay showed that Martinez had left a trailing elbow on England defender Fikayo Tomori

Hassan decided to dismiss the forward during the game at the Jeonju World Cup Stadium

England Under 20s were already 2-0 ahead when Martinez was dismissed, courtesy of a first-half header from Everton's Dominic Calvert-Lewin and a goal after the break from Newcastle's Adam Armstrong.

They wrapped up the victory with a penalty by Dominic Solanke in added time.

Paul Simpson's side take on Guinea on Tuesday in their second group stage game before concluding that segment of the competition with a match against South Korea.