Bolton Wanderers beat Red Star Belgrade 1-0 with a 45th-minute goal by Gavin McCann -- a fierce shot from the edge of the penalty area -- and top Group F, but are still not sure of advancing.
Bolton, who have played all of their group games, will qualify unless Aris draw with Bayern Munich and Braga beat Red Star in the final round of matches.
Red Star's third straight UEFA Cup loss means the Serbian champions have no chance of qualifying.
Before the match, Bolton protested the detention of hundreds of fans in their Belgrade hotel. The Serbian police banned them from visiting the city center and held them for hours because they feared clashes with notorious Red Star fans.
"[The club] shares the anger and discontent felt by our supporters detained temporarily ... without reasonable explanation," Bolton said in a statement.
The police move came after riots last weekend during a league match at Red Star's stadium, when the Belgrade fans attacked a plainclothes policeman trying to film them in the stands.
The policeman was forced to shoot into the air and sustained serious injuries. Several fans were arrested, including one man who was charged with attempted manslaughter.
Aris Salonica drew 1-1 with visiting Braga, so that, with Panionios winning, Greece could still have four teams in the next round.
Former European Cup finalists Panathinaikos were among the teams to have already qualified, while AEK Athens won on Wednesday.
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