The Greek Super League outfit face part stadium closure due to alleged racist chanting.
When Manchester United travel to Greece to take on Olympiacos in the round of 16 stage in the Champions League, they will do so in the Karaiskakis Stadium that will be part-closed, as their opponents have been hit with sanctions - including a £25,000 fine - due to the racist behaviour of their supporters.
The part of the ground that will be closed is the lower tier of the north stand and the retrospective action has been handed out by UEFA because of incidents relating to a game at the Karaiskakis, on December 10 versus Anderlecht.
A UEFA statement confirmed: 'Olympiacos have been sanctioned for the racist conduct of supporters, insufficient organisation, the setting-off of fireworks and the use of a laser.
'There will be a partial closure of the Greek club's stadium [and] they have also been fined.'
Zenit St Petersburg have also been embroiled, because of events against Austra Vienna on December 11 and will have to shut an area of the Petrovski Stadium when they host German hopefuls Borussia Dortmund. Zenit were fined more - £34,000.
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