Oasis has issued a warning against resale tickets for their reunion tour.

After much speculation online, the English rock band this week announced dates for 17 shows across the UK and Ireland in August and July next year.

A limited number of fans were able to purchase the first round of tickets through a ballot on Friday evening.

But tickets appeared on resale websites within minutes of a pre-sale, listed for thousands of pounds.

Fans shared screenshots of ticket listings on StubHub with asking prices of more than £6,000 ($11,644) for lower seating and general admission.

Oasis said according to the terms and conditions, tickets could only be resold at face value via Ticketmaster and Twickets.

"Tickets sold in breach of terms and conditions will be cancelled by the promoters," they wrote in a post to X.

Oasis promoters had previously issued a similar warning, telling fans tickets sold through "unauthorised resale platforms" would be in breach of terms and conditions and "may be cancelled".

Ahead of the pre-sale, promoters said standing tickets would cost £150 and standard seated tickets would range from £73 to £205.

The most expensive official package, available for five concerts at London's Wembley Stadium, is priced at £506.

About 1.4 million tickets are expected to be sold for the band's 17 shows across the UK and Ireland next year.

General sales will open on August 31 at 9am BST (6pm AEST) for the band's UK shows and 8am IST (5pm AEST) for its Ireland dates.

The English rock band announced they were reforming for the first time in 15 years earlier this week.

In-fighting between brothers Liam and Noel Gallagher boiled over on August 28, 2009, culminating in a backstage scuffle moments before they were set to play the Rock en Seine festival in Paris.

Noel Gallagher quit the band the next day, saying he "simply could not go on working with Liam a day longer".