UPDATE 1-Nigeria's Supreme Court to rule on Oct. 26 on election challenge

(Adds context in paragraphs 2-3)

ABUJA, Oct 25 (Reuters) - Nigeria's Supreme Court will rule on Thursday whether to uphold President Bola Tinubu's disputed February election victory, a court notice showed on Wednesday, after two of his main contenders challenged the result over alleged irregularities.

The decision by the Supreme Court will be final.

Atiku Abubakar of the People's Democratic Party and Peter Obi of the Labour Party, who came second and third respectively in the vote, on Monday asked the Supreme Court to quash a tribunal decision upholding Tinubu's win, in a last bid to overturn a result widely accepted by the international community. (Reporting by MacDonald Dzirutwe; Writing by Chijioke Ohuocha; Editing by Alexander Winning)