The incident took place outside the Flann O'Brien pub where supporters of the Glasgow club had gathered. Italian police said the pair have been transported to hospital for treatment.
Chelsea have stormed to victory against Arsenal in the Europa League 2019, claiming four goals to Arsenal's one.
The draw was made at lunchtime at UEFA's HQ.
Fans of Olympiacos FC referenced Netflix series La Casa De Papel as they cheered their club's win in the Europa League.
Man-of-the-match Griezmann strikes twice for Atletico while Marseille lost captain Payet to injury after 30 minutes
Wednesday night's clash sees the French club return from a more than 20-year cup final wilderness, while Atletico are seeking their third title this decade.
Excitement builds in Lyon's City Centre for tonight's showdown between Atletico Madrid and Marseille, where two of Europe's footballing legends give their predictions.
Olympique Marseille face Atletico Madrid in the showpiece event with hundreds of policemen and extra security measures deployed to prevent fans clashing outside the stadium and around the city.
Arsenal host Atletico Madrid in the Europa league semi-final first leg at the Emirates Stadium.
Lyon got to have a close-up look at the Europa League trophy when former Barcelona and French international football player Eric Abidal posed with cup at the Gadagne Museum, fresh from making the draw for the semi final.
More comebacks, this time in the Europa League, as Arsenal, Marseille, Red Bull Salzburg and Atletico Madrid book their place in the last four.
Arsenal's Laurent Koscielny, Nacho Monreal, Aaron Ramsey and Mesut Ozi were rested for the Gunners' last game and are expected to feature against CSKA Moscow.
Arsenal draw CSKA in Europa league.
The officer reportedly had a heart attack after being hit by a flare in violent clashes between Spartak Moscow and Athletic Bilbao fans
Evra has been summoned to an interview that will lead to disciplinary action
Manchester United and Ajax are in Stockholm for the Europa League final
Manchester United survived a late scare to draw at home to Celta Vigo and reach the Europa League final on Thursday.
English giants Manchester United will play Ajax in the Stockholm final after both teams qualified
Ajax beat Lyon 4-1 in the first leg of their Europa League semi-final, but will the French side's away goal prove crucial when the two sides meet again in France?
Manchester United, Ajax, Celta Vigo and Lyon reach the semi-finals of the Europa League
Manchester United are tied 1-1 with Anderlecht as they go into their Old Trafford leg