UEFA has ordered Legia Warsaw to play its next two European home matches without supporters due to racism by supporters.
The governing body also fined Legia €105,000 (around £83,160) over the incidents in Thursday’s 1-0 loss at Sporting Lokeren in the Europa League.
The visiting fans in Belgium were also involved in crowd disturbances and set off fireworks.
Legia were ordered to pay for the damage caused by its supporters and won’t be allowed fans at its next Europa League away game in the knockout phase.
The Polish club has already been fined over crowd disturbances at Metalist Kharkiv and for an illicit anti-UEFA banner at home to Aktobe.