Irish fans are disappointed and angered, as the August 29 show is the only Ireland show scheduled on the singer's latest tour, "The Flicker Sessions 2017."

So Niall Horan tickets sold out at 9.00000001 am today and I've been waiting since half and yesterday morn aswell no luck, how is this fair?

— Cathy Carleton (@shawnxmendes__) July 14, 2017

@TicketmasterIre what's the story with Niall horan tickets saying there's none since 9.01 did it sell out at pre sale or something ?

— Alison White (@xAlisonwhitex) July 14, 2017

@Ticketmaster how can tickets be sold out at 9 on the dot actual scam #niallhoran @NiallOfficial

— Rebecca Hanlon (@hanomolloy200) July 14, 2017

@NiallOfficial so disappointed tickets where gone straight away didn't even get a que on ticketmaster something dodgy there

— deborah connolly (@debsconn) July 14, 2017

There hasn't been any word from Horan as to whether he will announce more Ireland dates. In an Instagram post this week the singer said "for those of you wondering why I'm not stopping nearer you this time, please bear with me a little longer while I plan 2018. This is just the beginning and an opportunity for me to re-learn the craft of doing shows and touring in general."

Meanwhile Horan is also making headlines today as he became the "most-followed" One Direction member on Twitter, surpassing Harry Styles to reach 31 million followers.