Westlife say they would love to add extra Irish concert dates in Cork if their "bespoke gig" at Pairc Ui Chaoimh next August sells out.
Shane Filan, Mark Feehily, Nicky Byrne and Kian Egan said playing sell-out concerts for their Irish fans is like "being able to relive your youth."
"We've been doing this for 20 years and it is brilliant that our fans around the world still want to see us perform. It's an honour and a privilege," Nicky said.
Shane insisted the concert at Pairc Ui Chaoimh will be Ireland's only "bespoke concert" in 2020 - and ruled out any Dublin gigs next year.
However, the band held out the prospect of playing further gigs in Cork if the Friday, August 28, gig sells out.
"It will be a two-hour show, similar to Croke Park, but it will be a new show. We are putting together a brand new, bespoke show for 2020. It is specially designed for outdoor stadia."
They have ruled out gigs at further Irish venues in 2020.
"It is absolutely fantastic to be playing for our Irish fans. It really is like getting to relive our youth," Shane said.
"As far as we are concerned, we will play as many concerts as the people of Ireland want us to perform here in Cork. But this is our only summer stadium show in Ireland next year."
However, the band said the issue of any further concerts has not yet been decided.
"That is a matter for Denis Desmond (MCD), but we would absolutely love to play more concerts for our Irish fans," Nicky added.
Mark Feehily said they loved their concerts at Croke Park this year but wanted to be able to bring their new bespoke show outside Dublin to other parts of Ireland.
Their two sell-out Croke Park shows involved total ticket sales of 150,000.
Kian Egan said they were expecting one of the best concerts they have ever played.
"It is going to be a great night in Cork and we are really excited about it," he said.
To celebrate the announcement of the gig, all four Westlife members engaged in an impromptu kick-about on Pairc Ui Chaoimh's new pitch.
However, the support line-up for the concert remains a closely guarded secret.
"We will have a special guest for the concert next year but that won't be announced until Wednesday," Mr Desmond said.
The Cork concert will form part of a world tour aimed at supporting the band's 11th studio album Spectrum which is being released on November 8.
Tickets for the Pairc Ui Chaoimh show go on sale at 9am on Friday.