Young Boys fans came under attack from Anderlecht hooligans in the Belgium capital ahead of their Europa Conference League tie on Thursday.
The attack occurred at the Le Falstaff restaurant, located in the city’s centre, at around 9pm on Wednesday.
A group of around 30 Anderlecht hooligans dressed in black ambushed their Young Boys counterparts as they sat drinking in the restaurant.
It was a revenge attack for an assault on Anderlecht fans in Bern a week ago.