Greek police made multiple arrests to prevent clashes between hooligans of basketball clubs Olympiakos and Montenegro's Buducnost Podgorica in Piraeus on Friday.
The state-run Athens News Agency reported that 37 Buducnost supporters were arrested at a toll station outside Athens after three coaches were inspected by police authorities.
The buses were heading to Piraeus for the Euroleague game which Olympiakos won 92-70.
Police found 16 wooden posts, eight flares, one firecracker, one pepper spray, one hammer, one hood as well as slabs of marbles and stones, the report said..
Those supporters not arrested were ordered to return to Montenegro.
Greek media reported that Olympiakos hooligans waited for the showdown with their Buducnost counterparts and when they didn't show up instead fought with police outside the stadium one hour before the game began.
One car and one motorcycle were destroyed by fire bombs thrown by Olympiakos fans.