Lyon boss Bruno Genesio admitted it was worrying to see crowd trouble mar their 2-1 Europa League quarter-final first-leg win over Beskitas.

Crowd disturbances at Parc OL saw projectiles thrown, fans spill onto the pitch and kick-off delayed by 45 minutes.

Once the game finally got under way, Ryan Babel gave the Turkish side a first-half lead.

Fans clash at Lyon vs Besiktas Show all 7 1 /7 Fans clash at Lyon vs Besiktas Fans clash at Lyon vs Besiktas Besiktas' and Lyon's supporters fight in the tribune before the UEFA Europa League first leg quarter final football match between Lyon (OL) and Besiktas on April 13, 2017, at the Parc Olympique Lyonnais stadium in Decines-Charpieu, central-eastern France. / AFP PHOTO / PHILIPPE DESMAZES (Photo credit should read PHILIPPE DESMAZES/AFP/Getty Images) AFP/Getty Images Fans clash at Lyon vs Besiktas Besiktas' and Lyon's supporters fight before the UEFA Europa League first leg quarter final football match between Lyon (OL) and Besiktas on April 13, 2017, at the Parc Olympique Lyonnais stadium in Decines-Charpieu, central-eastern France. / AFP PHOTO / PHILIPPE DESMAZES (Photo credit should read PHILIPPE DESMAZES/AFP/Getty Images) AFP/Getty Images Fans clash at Lyon vs Besiktas Besiktas' fans gesture and shout against Lyon's fans as they stand in the tribune before the Europa League football match Olympique Lyonnais against Besiktas JK on April 13, 2017 at the Parc Olympique Lyonnais stadium in DÃ©cines-Charpieu near Lyon, southeastern France. / AFP PHOTO / PHILIPPE DESMAZES (Photo credit should read PHILIPPE DESMAZES/AFP/Getty Images) AFP/Getty Images Fans clash at Lyon vs Besiktas A Lyon supporter holds a flag after entering the pitch before the UEFA Europa League first leg quarter final football match between Lyon (OL) and Besiktas on April 13, 2017, at the Parc Olympique Lyonnais stadium in Decines-Charpieu, central-eastern France. / AFP PHOTO / JEFF PACHOUD (Photo credit should read JEFF PACHOUD/AFP/Getty Images) AFP/Getty Images Fans clash at Lyon vs Besiktas People stand on the field as Besiktas' and Lyon's fans fight in the tribune before the UEFA Europa League first leg quarter final football match between Lyon (OL) and Besiktas on April 13, 2017, at the Parc Olympique Lyonnais stadium in Decines-Charpieu, central-eastern France. / AFP PHOTO / PHILIPPE DESMAZES (Photo credit should read PHILIPPE DESMAZES/AFP/Getty Images) AFP/Getty Images Fans clash at Lyon vs Besiktas Police stand on the pitch after Besiktas' and Lyon's supporters fought before the UEFA Europa League first leg quarter final football match between Lyon (OL) and Besiktas on April 13, 2017, at the Parc Olympique Lyonnais stadium in Decines-Charpieu, central-eastern France. / AFP PHOTO / JEFF PACHOUD (Photo credit should read JEFF PACHOUD/AFP/Getty Images) AFP/Getty Images Fans clash at Lyon vs Besiktas French police stand guard after clashes between supporters before the UEFA Europa League first leg quarter final football match between Lyon (OL) and Besiktas on April 13, 2017, at the Parc Olympique Lyonnais stadium in Decines-Charpieu, central-eastern France. / AFP PHOTO / JEFF PACHOUD (Photo credit should read JEFF PACHOUD/AFP/Getty Images) AFP/Getty Images

However, Lyon responded dramatically late on, with Corentin Tolisso equalising seven minutes from time before veteran Jeremy Morel nabbed the winner.

"It is distressing to see such incidents," Genesio said of the off-field drama. "This is the reverse of what should happen.

"We are here to give pleasure to people and not to see that. You had to stay focused."

On the pitch Lyon ran out 2-1 winners but Genesio urged his players not to get carried away ahead of the second leg.

"We dominated in the first period, with a goal conceded from a set-piece," he added. "We were higher after the break and we were worried about our opponent.

"It's good to come back and win the match against a very good team.

"It's only half-time in this quarter-final. We will have to go to Istanbul with all our weapons, all our qualities."