The musician announced last week that he and his brother Noel would come back for a reunion tour in 2025, and on Saturday the series of UK and Ireland shows sold out in less than a day.
Fans were beset with problems getting onto ticket websites, from being labelled bots and being kicked out of queuing to some ending up paying more than the advertised price of Stg148 ($A290) as costs surged past Stg355.
The Competition and Markets Authority (CMA) on Thursday launched an investigation into Ticketmaster, including how so-called 'dynamic pricing' may have been used.
On Friday, Gallagher wrote on X, formerly Twitter: "Oasis are back (you're) welcome and I hear (their) attitude stinks, good to know something's never change."
When asked if he would do a free concert, he replied: "Don't be silly."
Another referenced his mother Peggy, saying how she might feel about ticket fiasco, and Gallagher responded saying: "She's gutted she couldn't get a ticket."
He also said: "Smug only kidding, Smug as f***. I told you all we were gonna get back together one fine day."
Gallagher also appeared to joke that he had "loads" of tickets left, but could only sell them for Stg100,000 and they would be "kneeling only".
The CMA will also scrutinise whether the sale of Oasis tickets by Ticketmaster might have breached consumer protection law.
Ticketmaster maintains it does not set concert prices and its website states this is down to the "event organiser" that "has priced these tickets according to their market value".
"We are committed to co-operating with the CMA and look forward to sharing more facts about the ticket sale with them," a Ticketmaster spokesman said.
Oasis said in a statement: "It needs to be made clear that Oasis leave decisions on ticketing and pricing entirely to their promoters and management, and at no time had any awareness that dynamic pricing was going to be used."
Following the chaos last weekend, Oasis announced new Wembley Stadium dates on September 27 and 28, 2025, using a lottery system.
The final UK Live '25 tour tickets released will use a new "staggered invitation-only ballot process", with applications to join the ballot opened first to those who were unsuccessful in the initial sale.
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