West Ham manager David Moyes said his side "want to be in Europe after Christmas" as the Hammers face Olympiakos on Thursday in Group A in the Europa League.
The Hammers are top of their group on six points, level on goal difference with Germany's Freiburg.
West Ham won the Europa Conference League last season, their first European trophy since 1965.
"I want to make sure we get the wins and qualify," said Moyes.
"We're going out there, we want to be in Europe after Christmas, if we can win tomorrow night we might have got ourselves in one of the tournaments, whether it's the Europa League or the Conference.