The Supreme Court will rule this morning in the €2m Mayo Lotto syndicate dispute.
Four members of the syndicate, which won the jackpot in 2001, challenged a High Court ruling which held that they were wrong to exclude a fifth man from the prize.
The men claim that Martin Horan, from Bohola, was removed from the syndicate in October of 2000 because his contributions were in arrears.
The jackpot was won in January 2001.
In 2004, Martin Horan went to the High Court and won his case against them.
They went to the Supreme Court last month and argued that a contract could not exist because he had not paid his contributions.