The former Boyzone singer, who released Fires earlier this week, insisted that physical sales are traditionally low in his home country.
"It's rubbish. The number one album midweek here sold about 700 - it's not like sales for anything are sky high," he told Strawberry Alarm Clock on FM104.
"Album sales in Ireland are never going to keep you in Gucci - you do it to make a presence.
"They didn't include my download sales either and the downloads were quite substantially more than that but I'm not going to get into a battle about it."
He added: "Hopefully I'll be top three in the UK. When I saw what was written here in Ireland I was like, 'What the hell?' I mean, it's number four in the UK midweek charts already."
Keating concluded by saying that he "couldn't be happier" with Fires.
Watch Ronan Keating's video for 'Fires' below: