Celtic have retained their Champions League place after Legia Warsaw's appeal against their exclusion was dismissed by UEFA.
Legia were found to have fielded an ineligible player, Bartosz Bereszynski, in the second leg of their third qualifying round clash against the Glasgow giants which they won 2-0 to follow a 4-1 first-leg success. Celtic were duly awarded a 3-0 win and progressed on away goals.
The Polish side's appeal was heard by UEFA's Control, Ethics and Disciplinary Body and after receiving the decision on Thursday, club owner Dariusz Mioduski wrote on Twitter: "Unfortunately for now football is not winning... We are going to CAS."
The verdict was confirmed in a UEFA statement which read: "The UEFA Appeals Body met yesterday following an appeal by Legia Warszawa against the decision taken by the UEFA Control, Ethics and Disciplinary Body on 8 August.
"The appeal lodged by the Polish club was rejected and, therefore, the original decision of the UEFA Control, Ethics and Disciplinary Body is confirmed.
"The Control, Ethics and Disciplinary Body had sanctioned Legia for fielding a suspended player (Article 18 of the Regulations of the UEFA Champions League, 2014/15 competition, and Article 21 of the UEFA Disciplinary Regulations, 2014 edition) in the 2014/15 UEFA Champions League third qualifying round return leg against Celtic FC in Edinburgh on 6 August. That match has been declared as a forfeit, meaning Legia lost 3-0."
Legia president Boguslaw Lesnodorski echoed Mioduski's pledge to take the matter to the Court of Arbitration for Sport.
He wrote on Twitter: "Negative decision, it's hard even to comment, we are using the CAS (we plan to tomorrow) and otherwise we are focused only on the games."
Legia believed Bereszynski's suspension had been served after he missed both legs of the previous qualifier against St Patrick's Athletic as well as the first leg against Celtic, but their failure to register him for the St Pat's tie proved costly.
Celtic will therefore face Slovenian side Maribor in the play-off round, leaving Legia to take on Aktobe of Kazakhstan in the Europa League play-off.
Mioduski released a statement through the club's official website which stressed Legia's determination to keep fighting for Champions League reinstatement.
The statement read: "Till the last moment we hoped that the spirit of sport wins, we find the decision extremely unfair.
"However we expected that decision and were prepared for it. We are to appeal to the CAS promptly.
"We will use the full appeal procedure, in order to get back our result that was fairly gained on the pitch.
"We will certainly fully subordinate to the final verdict. But I still hope that football will win, as well as the values it is based on: fair-play and respect to the on-the-pitch result."
Lesnodorski added: "We hope that CAS will judge our case as soon as possible.
"We don't give up and keep fighting. Our lawyers are now working hard on the case, while the team prepares for the forthcoming matches. We aim high as always."
Before the verdict, Hoops manager Ronny Deila spoke only about facing Maribor in the play-off.
He said: "We have prepared for Maribor. They are a good team and they have been the champions of Slovenia in the last three years.
"There is nothing easy in the Champions League so it is going to be a hard game but we know what we are able to do when we are at our best.
"It is hard to say if they are better or worse (than Legia Warsaw) but they are a good team.
"Legia was a good team as well, so nothing is easy but we can do much better than we did against Legia and we will play at Celtic Park and those two things can be good for us.
"I have seen European nights at Celtic Park and I understand why you get results there and that's because you have unbelievable fans behind you."
CAS general secretary Matthieu Reeb later revealed the court could make a decision on Legia's second appeal before next week's games.
Reeb told STV: "We can organise a fast-track procedure which takes into account the time constraints and whatever kind of decision, be it an order or final award, and we can try to do it within the appropriate time.
"It's possible if the parties are prepared to do that. All our councils, parties, all people involved in this matter should be available on short notice.
"If there is an appeal, it should be filed as soon as possible so that the start of the procedure is not delayed. We can also use Saturday and Sunday to work on this case. It is feasible but there is no time to lose.
"It depends on what is requested by Legia. If the request is to declare the UEFA decision illegal or contrary to the rules, it is a legal discussion and we should be able to provide an answer after reviewing not only the UEFA decision and the rules, but also the arguments of the parties. This can be done on a short time frame."
Reeb added: "If Legia would request CAS to render a decision by way of provisional measures, this could at least give an answer to the case before the start of the competition.
"But if the parties are also ready we could organise a hearing say for example for Monday so that the case is resolved for all."