The Europa League draw made on Friday means Manchester United face a potential final with Inter Milan.
A Bulgarian man has died in Thessaloniki after being attacked by fans of Greek football club PAOK and hit by a car.
The Athens derby between was abandoned with Olympiakos 1-0 ahead and it is likely Panathinaikos will receive a fine and possible points deduction.
Referee Thanassis Tzilos was attacked on Wednesday by three masked men near his home in Larissa.
The Italian burst onto the scene with an important last-gasp winner on his professional debut, but his career has taken a downward spiral since.
Yaya Toure claims he rejected offers from other clubs in Europe, Asia and the United States to return to Greek Super League side Olympiakos.
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.
Arsenal announced the deal on Friday, with Akpom moving abroad again after spending part of last season on loan in Belgium.
Arsenal defender Sokratis Papastathopoulos and AEK Athens players have pledged to donate blood and give money in support of those affected.
Greece's oldest football club Panathinaikos have been banned from European competition for three seasons for failing to pay their debts.
Panathinaikos say long-delayed payments have been made to Michael Essien and two others in hopes of avoiding losing nine points in the Greek league.
The Greek Superleague have deducted three points from Panathinaikos after the club failed to settle unpaid wages with former player Jens Wemmer.
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.
Greek Superleague disciplinary committee has also docked the club three points and fined them €63,000.
Greece has lifted its suspension of football after saying it received a commitment from clubs to reform rules aimed at combating violence.
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.
Herbert Huebel said a series of incidents, culminating in a gun-toting club owner running onto the pitch, were "unacceptable."
PAOK president Ivan Savvidis has apologised for storming the pitch during Sunday's clash with AEK Athens while appearing to carry a gun.
Greece's sports minister says Greek Super League matches have been suspended indefinitely after the gun-toting owner of PAOK marched onto the pitch.
A disputed goal in a Greek league match on Sunday between AEK and PAOK led to a pitch invasion by one of the team owners, who appeared to have a gun.
About 3,000 PAOK supporters marched peacefully through Thessaloniki on Thursday to protest against the Greek club's punishment for fan violence.
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.