An international sports tribunal will on Monday rule on Michel Platini's final appeal against a six-year ban imposed by FIFA and decide whether he can return as UEFA president.
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Platini, once a highly revered French international, was banned for "conflict of interest" over a suspect US$2 million payment authorised by former FIFA leader Sepp Blatter.
Platini and Blatter have been the two highest profile figures to fall over the scandals that have hit FIFA.
If the Court of Arbitration for Sport (CAS) upholds his appeal, Platini would return as UEFA president.
That would allow him to officiate over the start of European Championship finals that start in his native France on June 10. Platini was a key organizer up until his suspension in December.
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The French football legend, UEFA president since 2007, acknowledged when he went to the CAS tribunal on April 29 that if he failed "the story is over."
The Lausanne-based tribunal is to release its verdict at 09:00 GMT.
A rejection of the appeal would also mean UEFA holds its key competition without a leader.
UEFA has not named an interim president during Platini's suspension, leaving senior vice president Angel Maria Villar of Spain to fill in.
UEFA officials say an election for a president would take at least one month to organize. Several national associations say they would prefer to have a proper three month campaign which could push any vote back to a UEFA meeting to be held in Athens in September.
Platini and Blatter have both denied any wrongdoing over the 2011 payment made without a contract for consulting work carried out a decade earlier. They say there was an "oral contract."