Olympiakos are eliminated from the group stage of UCL, but their quality is ideal in the stage of UEL. Besides, they have won all of their last 3 games, and they are now in a 18-match unbeaten run. Moreover, they have grabbed 8 successive wins at home, and they are undefeated for recent 11 home fixtures.
Now Olympiakos are not so inferior in AH line in this match against EPL powerhouse Arsenal. Besides, Olympiakos are superior by grabbing 3 wins and 1 loss in their last 4 home games against Arsenal.
So Olympiakos are expected to remain unbeaten at home.