The Bhoys were dumped out of the Champions League qualifiers by Cluj, as they produced a shock 4-3 win at Parkhead last month to advance into the final qualifying round.
Cluj couldn't make it any further though, meaning they dropped into the Europa League – and they'll be facing Celtic again having been drawn in the same group, alongside Lazio and Rennes.
Celtic will be hoping to avoid another disaster against the Romanian outfit, but it means they'll run into attacker Billel Omrani once again.
Omrani scored twice to knock Celtic out of the Champions League, with the 26-year-old proving to be a thorn in the side of Neil Lennon's men.