Team Sky rider Gianni Moscon has been expelled from the 2018 Tour de France after punching Elie Gesbert of the Fortuneo-Samsic team in the opening kilometre of Stage 15 on Sunday.
The race jury reviewed footage of the incident, which showed Moscon turning on his bike and throwing a punch at Gebert, who managed to remain upright on his bike.
The Tour is using a video commissaire for the first time, with a panel monitoring events in a truck at the finish.
Moscon was officially expelled when the stage results were distributed shortly after 7.30pm local time on Sunday.
The commissaires expelled Moscon, citing article 12.1040.30.1 of the UCI regulations, which covers “acts of violence among riders” and allows for disqualification in the event of “particular serious aggression.”
Team Sky manager Dave Brailsford and directeur sportif Nicolas Portal visited the technical zone at the finish line after the stage to review footage with the commissaires and plea Moscon's case.
“The rider pleaded his case through his directeurs sportifs who were heard by the jury of commissaires,” read the statement from the race jury.
In a statement, Team Sky said: "We support and accept the decision by the race organisers to exclude Gianni Moscon from the Tour de France.
“Gianni is desperately disappointed in his behaviour and knows that he has let himself, the Team and the race down.
“We will address this incident with Gianni once the Tour is complete and decide then if any further action should be taken."
Moscon is no stranger to controversy, having been accused of deliberately causing a fellow riser to crash, being banned by Team Sky for racial abuse and being disqualified from last year’s World Championships road race when he caught a tow from the Italian team car.
The Italian has apologised for his actions at the Tour de France, posting a video on Team Sky’s Twitter page.
"I'm sorry for today's incident, and totally regret my actions," Moscon said in the video posted on Sunday evening.
"I would like to personally apologise to Elie Gesbert for the incident on today's stage."