Virtually no-one bothered to wear a mask at the spontaneous festivities during which security forces made 36 arrests for vandalism and violence.
Police used tear gas to break up groups of supporters brandishing large flags and letting off firecrackers who had come to celebrate PSG's 3-0 victory over Leipzig.
The spontaneous gatherings contravene policy banning large crowds in public spaces due to Covid-19.
Scuffles and brawls broke out early on Wednesday as some supporters attacked a police van and threw missiles.
Witnesses said barricades were set up and some shops looted.
Comme d'habitude française, hélas, la fête sur les Champs-Élysées après la victoire du #PSG a été gâchée par la racaille : policiers caillassés, véhicules dégradés, poubelles incendiées. Une violence chronique qu'a permis l'immobilisme de l'Etat. pic.twitter.com/VgK55FPslp
— Gilbert Collard (@GilbertCollard) August 19, 2020
Politician Gilbert Collard took to social media condemning the violence. He also blamed the government.
"As usual, the party on the Champs Elysées after the PSG victory was spoilt by thugs; police attacked, vehicles damaged, bins set on fire. This chronic violence comes down to state inaction," he wrote on Twitter.
Three minors among the 36 arrested
The Paris court on Wednesday said out of 36 people, 14 people were taken into custody for violence against members of authority. Three were detained for intention to participate in violence and the rest for aggravated theft or violence against other bystanders.
De plus en plus de supporters présents sur les #ChampsElysees pour fêter la victoire du #PSG lors du match #LEIPSG.#PSGRBL #ChampionsLeague pic.twitter.com/bYogzgqyJz
— Yazid Bouziar (@ybouziar) August 18, 2020
Masks are now compulsory in all public indoor spaces, and many outdoor spaces, especially in crowded tourist areas.
The Ile-de-France region, which includes Paris and its suburbs, is considered a 'red zone' for the risk of Covid-19, due to a spike in the number of infections in recent days.
Police said they did not hand out any 135 euro fines on Tuesday evening, saying they were focusing on prevention and warnings.
Celebrate in private
The French sports minister, Roxana Maracineanu, on Wednesday called for fans to avoid large gatherings in the street and to celebrate responsibly.
"They should celebrate their team's victory by staying at home or with close friends who they are sure are not contaminated," she told France Info.
