Police spokesman Andrei Emil said violence continued during Thursday's game, which Dinamo won 3-0.
Croat fans, some wearing masks and scarves covering their faces, hurled seats, firecrackers and stones during the game.
Daily Gazeta Sporturilor reported they shouted "Down with the Serbs!''
Tension
Serb B-92 TV reported that Timisoara fans taunted the Croats yelling "Serbia, Serbia!''
Fighting continued in downtown Timisoara after the match. The city has a large population of Serbs and is close to the Serbian border.
Emil said police detained some 117 Croats and 14 Romanians after the match. The newspaper said 10 people, including a police officer, were injured.
Police escorted Croat fans to the Hungarian border, some 37 miles west of Timisoara after the match.
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