The pair, whose regular arguments caused the Manchester band to split up in 2009, are "all good again" according to Liam.
The former Oasis frontman, who released his debut solo album As You Were earlier this year, wished his sibling a merry Christmas on Twitter.
I wanna say Happy Xmas to team NG it's been a great year thanks for everything looking forward to seeing you tmorrow AS YOU WERE LG x
— Liam Gallagher (@liamgallagher) December 19, 2017
He wrote: "I wanna say Happy Xmas to team NG it's been a great year thanks for everything looking forward to seeing you tmorrow AS YOU WERE LG x."
Fans reacted to the post, with many questioning whether an Oasis reunion could be on the cards in 2018.
One wrote: "Team who? Your not going to have a meltdown on here come Christmas day are you Liam when NG doesn't reach out to you."
Liam replied: "He's already reached out... We're all good again."
But the chances of a reunion still appear remote. Earlier this year Noel said Oasis getting back together would "kill me as a person".
He made the comment as he promoted his own solo record, the third under his moniker of Noel Gallagher's High Flying Birds.
Liam has also poured scorn on suggestions of a comeback throughout 2017.
In June, he criticised his older brother for not attending a tribute concert following the bombing at Manchester Arena.
He wrote on Twitter: "Noels out of the f****** country weren't we all love get on a f****** plane and play your tunes for the kids you sad f***."
Nathan is the Operations Director and one half of Vale Breakfast on Bro Radio. You'll hear him reading local news, hosting at local events and presenting our facebook live videos.