The Hoops are back in Europe after Legia Warsaw were thrown out of the competition for fielding an ineligible player for four minutes of their second leg win at Murrayfield.
Celtic have been awarded a 3-0 victory in the second leg which means the tie finished 4-4.
The Scottish champions go though on the away goals rule.
Celtic are away for the first leg which will be played on the 19th of this month.
Legia say they will appeal the decision, and Andy Walker says his former side have had a big let-off.