Barcelona are at the top of Group D, with nine points after three matches, while their hosts today are last with no points.
Flashscore presents the key facts before the match:
Surprisingly, this will be only the second time these two teams have ever met in an official game. In the first outing, just 2 weeks ago, Barcelona defeated the Greeks 3-1.
Olympiakos haven’t won a game so far in Group D. They need a victory if they want to fight for third place with Sporting Lisbon and aim for the Europa League place.
Olympiakos will face Barcelona after a painful recent defeat against their main rivals in the Greek League, Panathinaikos (1-0).
Barcelona are still unbeaten this season in all three competitions they have played in, winning every game bar a draw in La Liga against Atletico.
Messi scored his 100th Champions League (CL) goal in the last game against Olympiakos at home. He has netted 3 times in the competition this season.
All of Barcelona’s goals (7) have been scored with the left foot (5), apart from 2 own goals.
Olympiakos have conceded at least 2 goals in the first 3 games of the Group Stage – so expect goals!
Faithful to their philosophy, Barcelona average 67% possession in their CL games and have a stunning 90% passing accuracy. They complete roughly 760 passes per game.
Olympiakos: E. Ben (doubtful), H. Milic (doubtful)
Barcelona: O. Dembele (muscle injury), A. Iniesta (thigh injury), G. Pique (red card), Rafinha (knee injury), A. Turan (ankle injury), A. Vidal (ankle injury).