The pair, who have been sidelined since picking up injuries in the Premier League defeat at Stoke City on Feb. 1, have not travelled to Greece.
"Jones and Evans haven't travelled. Everybody else is here," Moyes told a news conference ahead of the match against the Greek Super League leaders at the Karaiskakis Stadium.
"It's a really tough game, Olympiakos have a good record here and we know, over the tie, we'll have to play well to qualify.
"Olympiakos did very well against PSG (Paris St Germain) and Benfica. They came through a difficult group, they have a great home record here. We know it will be a difficult night. They have a big support. It's far from an easy match."
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