Pogacar was near the end of stage 14 at Pla d'Adet in the Pyrenees when he was forced to dodge a fan who stepped onto the road and tossed some chips under his nose.

Moments after the incident with the Slovenian star, the fan did the same to Vingegaard.

Retired Australian professional cyclist Adam Hansen, now president of the Professional Cyclists Association (CPA), posted on social media that his organisation would follow up on the incidents.

"The CPA will take legal action against this guy with pleasure due to what he did to both Pogacar and Vingegaard," Hansen wrote in a post on X.

"This is disrespectful and will not be tolerated."

Vingegaard finished 39 seconds behind Pogacar, while Belgium's Remco Evenepoel, who was second in the general classification before stage 14, finished 70 seconds behind, meaning he slips to third overall behind the Dane.

"There was quite a bit of booing, and someone was throwing chips; I heard also they threw the chips at Tadej, and that's strange to do," Vingegaard said after the stage.

"Just stay off the road. I don't understand why you go to a bike race and boo at people."

According to a report in Le Parisien, the spectator was arrested by the police and taken into custody for aggravated violence. The man was not able to be questioned until he sobered up.

The Project with AAP.