Legia Warsaw have confirmed they have submitted an appeal to the Court of Arbitration for Sport over their expulsion from the Champions League.

The Polish side were punished by UEFA for fielding an ineligible player in their 6-1 aggregate win over Celtic in the third qualifying round of European football’s elite club competition.

Legia appealed UEFA’s decision to award Celtic a 3-0 third qualifying round second-leg win which saw the Scottish champions progress to the play-offs on away goals, but on Thursday the organisation’s appeals body upheld the decision, prompting Legia to ask CAS to intervene.

Legia failed to submit the prompt appeal to CAS they had promised, but the club confirmed late on Friday evening they had indeed sought arbitration from the Switzerland-based organisation.

A statement on Legia’s website said: “Legia Warsaw announces that today an appeal has been submitted to the Court of Arbitration for Sport in Lausanne (CAS) against the decision of the UEFA Appeals Committee of 13 August 2014.”

CAS confirmed it had received Legia’s appeal, saying: “Legia requests urgent provisional measures from CAS allowing the Polish club to participate in the play-offs of the Champions League.

“The CAS has immediately initiated an arbitration procedure.

“A decision on request for provisional measures is likely to be issued on Monday.”