The brothers were the heart of the legendary Britpop band until they decided to break up the group after an altercation backstage at a gig in Paris, France in 2009.
At the premiere of Supersonic, a new documentary film about the band's glory years, on Sunday (02Oct16), Liam said he hasn't forgiven his brother for wrecking his career with Oasis in order to go solo.
"He just wanted to do this thing, there is a lot of angst there," the 44-year-old singer told Sky News. "For someone to ruin my Oasis career to further his own, we have got to get past that a little bit."
Never one to hold back in criticising his sibling, Liam explained Noel's absence from the premiere in uncompromising terms.
"He won't be here," the rocker said. "He's in one of his really, really, really, big houses, probably eating tofu, while having a f**king face peel, ain't that right, man of the people?"
Despite the pair's antipathy, Liam said he was prepared to be part of an Oasis reunion if his brother was.
"If it happens tomorrow, I'm ready, my bags are packed. If it happens in a year, I'm still ready, if it happens in 10 years, I'm still ready," he explained, adding, "If it happens, it happens, if it doesn't, it f**king doesn't, we move on."
With no Oasis reunion currently on the cards and his band Beady Eye having split in 2014, Liam is currently working on a solo album, due out next year (17).