Hours before the first jumble of this years final four Greek and Turkish collided in Turkey injuring 5 Greek fans.
According to reports 4 Turkish were arrested.
At 18:30 Olympiakos will face CSKA Moscow in there first game with a place for the final at stake.
The other game will take place at 21:30 between Fenerbahce and holders Real Madrid.
Click the video below to see the incidents in Turkey: