Greece side, Olympiakos on Tuesday held Spanish giants, Barcelona to a goalless draw at the Stadio Georgios Karaiskaki.
The result gives Olympiakos a slim Champions League hope until match-day five at least.
The Greece club has become the only second team to prevent Barcelona from winning in their last 15 outings.
Olympiakos held on for a hard-earned draw to give them their first point of the campaign.
Barca missed the chance to qualify for the last 16 of the Champions League with two games to spare.
Barcelona still lead Group D, but they must wait until at least their next match against second-place Juventus in Turin to guarantee their place in the knockout rounds for a 14th consecutive season.
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