AEK Athens will face either Levski Sofia or Kairat in the next round of Champions League qualifying, while Olympiacos will meet either Union Saint-Gilloise or Bodø/Glimt, depending on how those two-legged ties finish.
Levski Sofia beat Kairat 1-0, putting themselves in pole position to be paired with AEK.
Saint-Gilloise and Bodø/Glimt share six goals
Union Saint-Gilloise and Bodø/Glimt drew 3-3, leaving their tie unresolved and Olympiacos's next opponent still unknown.
Olympiacos held by NEC Nijmegen
Olympiacos drew 0-0 with NEC Nijmegen at the Karaiskaki Stadium, meaning qualification for the play-off round will be decided in the return leg in the Netherlands.
NEC Nijmegen's best player, Kodai Sano, had already been sold to Eindhoven for 15 million euros and did not feature at Karaiskaki.
Olympiacos coach Mendilibar said the scoreless draw was not a bad result for how the team had looked, and that qualification remained open.
Olympiacos player Zota Silva said the team had given everything.
AEK close in on Vitalis transfer
Separately, Milan Vitalis travelled to Athens to complete his transfer to AEK.
