Rumours escalated on Sunday evening after the pair shared the same video on social media, written in the Oasis style, teasing an announcement on Tuesday at 5pm (AEST).
The same date and time appeared on big screens as Liam finished his headline slot at Reading Festival on Sunday.
— Noel Gallagher (@NoelGallagher) pic.twitter.com/brojDaVHpxAugust 25, 2024
The announcement will come before tracks from the first recording session for Oasis' debut album Definitely Maybe are released on Friday, marking its 30-year anniversary.
Unheard versions of songs including Live Forever, Cigarettes & Alcohol and Rock 'N' Roll Star were taken from their first recording session as a signed band, at Monnow Valley Studio in Rockfield, Monmouthshire.
The recordings were scrapped before the band re-recorded the album at Sawmills Studios in Cornwall.
Fans of the Manchester rock band have pleaded with the brothers to regroup since they disbanded in 2009, prompted by a backstage brawl at the Rock en Seine festival in Paris.
Reunion rumours have intensified recently amid the apparent thawing in the feud between the pair.
A report in The Sunday Times cited industry insiders who claimed the brothers were set to perform a string of gigs next year, including shows at London's Wembley Stadium and Manchester's Heaton Park.
There is also speculation that a Glastonbury headline slot could be in the works.
Hours before the announcement, posters began circulating online which featured potential Oasis tour dates with special guests including LCD Soundsystem, Blossoms, Fontaines DC and Kasabian.
It is not known if the poster has been leaked or fabricated, but speculation continued to grow regarding a reunion.
Liam fuelled the rumours by offering some tongue-in-check responses to fans who flooded him with messages on social media asking for confirmation.
After The Times posted the article on X, formerly Twitter, a fan said Heaton Park is a "terrible venue for concerts", with Liam responding: "See you down the front."
When another asked when the reunion dates will be announced, he replied: "Next Friday."
The rocker also tweeted on Sunday morning that he "never did like that word FORMER".
I never did like that word FORMER— Liam Gallagher (@liamgallagher) August 25, 2024
Liam has been touring the UK this summer on his Definitely Maybe tour to celebrate the 30 years since its release in 1994.
Noel has been absent from the concerts but during a show in Cardiff, Liam made a point of dedicating Half The World Away to his "little brother", saying he is "still playing hard to get".
Liam also played Oasis hits during his headline performance at Leeds Festival on Friday night.
Fans were also surprised to hear Noel pay Liam a string of compliments in an interview released last week with music journalist John Robb at Manchester's Sifters Records in honour of the album's 30th anniversary.
Reflecting on Liam's performance on a number of their hits, Noel said: "It's the delivery or the tone of his voice and the attitude.
"I don't have the same attitude as him."
He also jokingly compared Liam's voice to "10 shots of tequila on a Friday night" and his own as "half a Guinness on a Tuesday".
Formed in 1991, the Britpop group rose to fame with hits like Wonderwall, Don't Look Back In Anger and Stop Crying Your Heart Out.
They went on to become one of the biggest bands in British music history before their break-up in 2009.
The brothers went on to have successful separate careers, with Noel fronting the group Noel Gallagher's High Flying Birds.
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