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Olympiakos battled back from two-goals down to earn a 2-2 draw with Tottenham in their Champions League Group B opener in Athens on Wednesday night.
Real Madrid will face Paris Saint-Germain in the Champions League group stage this season.
Red Star Belgrade drew away to Swiss side Young Boys while Olympiakos thumped Krasnodar in the first leg of the Champions League playoff round tie.
The Athens derby between was abandoned with Olympiakos 1-0 ahead and it is likely Panathinaikos will receive a fine and possible points deduction.
Olympiakos pulled off a stunning 3-1 Europa League win over AC Milan that put them into the round of 32 and sent the Italians crashing out.
Former Manchester City and Barcelona midfielder Yaya Toure has left Olympiakos three months after rejoining the Greek Super League club.
Substitute Patrick Cutrone netted twice in nine minutes to lift seven-time European champion AC Milan to a 3-1 comeback win at home to Olympiakos.
Yaya Toure claims he rejected offers from other clubs in Europe, Asia and the United States to return to Greek Super League side Olympiakos.
The Chilean managed the Ivorian during his time at Manchester City and a reunion had been mooted after Yaya Toure left the Etihad this summer.
Yaya Toure is closing on a move to Greek club Olympiakos, sources close to the club have told ESPN FC.
A Burnley fan was stabbed in the leg and four others were injured in clashes in Athens before Thursday's Europa League playoff defeat by Olympiakos.
Burnley will need a rousing comeback next week after suffering a 3-1 away defeat to Olympiakos in the first leg of their Europa League playoff.
Olympiakos owner Evangelos Marinakis has fined his players €400,000 and ordered some of them to go on holiday until the end of the season.
Scores of football fans clashed with police in the Greek city of Piraeus as they tried to disrupt a speech given by the country's finance minister.
Evangelos Marinakis was cleared by the Supreme Court but could still face a charge of bribery relating to match manipulation, reports in Greece said.
Vangelis Marinakis says drug-trafficking charges against him are part of a Greek government-led "conspiracy" to silence dissent.
A Greek sports court has deducted three points from title contenders PAOK for match violence.
Brisbane defender Avraam Papadopoulos has been handed a suspended two-and-a-half year jail sentence by a Greek court for illegally betting on matches.
Olympiakos coach Oscar Garcia was hit by an object thrown from the crowd ahead of a Greek Superleague game between PAOK Salonika and Olympiakos.
Olympiakos are planning an appeal after the Greek champions were docked three points by a court on Monday following fan violence.
Olympiakos have re-signed Kevin Mirallas from Everton on loan until the end of the season, the clubs confirmed on Sunday.
Kevin Mirallas is set to return to Olympiakos after the Greek club announced a deal has been agreed with Everton.
Juventus secured their place in the round of 16 of the Champions League with a 2-0 victory against Olympiakos in Greece.