Legia Warsaw co-owner Dariusz Mioduski has asked Celtic for a one-off tie to decide which side should progress in the Champions League.
Celtic were handed a lifeline in Europe's premier club competition after Legia were punished for fielding an ineligible player in their 6-1 aggregate win over the Scottish champions in the third qualifying round.
Legia boss Henning Berg swiftly vowed that his club would appeal, and Mioduski on Sunday issued an open letter stating his side's case and asking the Hoops to "settle this matter honourably".
After reflecting on Celtic's "beautiful" history, Mioduski said: "I therefore call on you to refer your best traditions of honour and honesty, that your famous club has been know for during the last 126 years. Do not destroy the beautiful legacy, that you inherited from the past generations of 'The Bhoys'.
"I call on you to act according to the spirit of the game and rules of fair play - to issue a joint statement to the UEFA disciplinary bodies. Let's meet in Warsaw or Glasgow and settle this matter honourably."