Leicester's hopes of sealing top spot in Europa League Group G with a game to spare were dashed by Ukrainian side Zorya Luhansk, who grabbed a late winner through substitute Allahyar Sayyadmanesh on a freezing night in Zaporizhzhia.
A win would have been all but enough for the Foxes, but they might now have to defeat AEK Athens in their final match to ensure that top status.
Manager Brendan Rodgers made several changes to the line-up that started in the 2-1 defeat by Fulham, but welcomed back senior players Ricardo Pereira, Caglar Soyuncu and Wilfred Ndidi following their respective spells on the sidelines.