Celtic have been reinstated into the UEFA Europa League after UEFA upheld the club's complaint that Swiss side Sion fielded ineligible players in their play-off matches.
Sion knocked Celtic out of the competition with a 3-1 aggregate victory, but were charged by UEFA for using five ineligible players in the two-legged play-off tie against the Scottish team.
A statement from UEFA read: "The Scottish club questioned the eligibility of a number of the Sion players who participated in these matches, with the Swiss side winning 3-1 on aggregate. The Control and Disciplinary Body accepted both protests and decided to award both ties to Celtic by forfeit (3-0). As a consequence, Celtic are qualified for the UEFA Europa League group stage."
UEFA ruled that Sion's Pascal Feindouno, Gabri, Mario Mutsch, Jose Goncalves and Billy Ketkeophomphone all took the field against Neil Lennon's men even though they were not eligible.
The five players weren't allowed to play as they were signed with the club still under a transfer ban imposed after breaching rules over the signing of Egyptian goalkeeper Essam El-Hadary three years ago.
Sion were initially drawn against Atletico Madrid, Udinese and Rennes in the group stages of the Europa League, but Celtic have now been told they will now take the Swiss side's place in the competition.
Sion have two rights of appeal, first to UEFA and the second with the Court of Arbitration for Sport (CAS) who maintain they are the final voice.