At 8.10am more than 280,000 people were waiting to buy tickets for the gigs on Friday, September 9th and Saturday, September 10th.
Planning permission has already been given for the two concerts, but there is room for five in total.
The country singer’s five concerts at the venue in 2014 were cancelled because of objections from locals and a refusal by Dublin City Council to grant planning permission for the events.
Speaking at a press conference on Monday, Brooks played down the possibility of being able to sell five concerts out this time around.
Referring to the cancelled dates he said he hoped there would be a “blessing in that curse and now hopefully we have a chance to play Ireland”.
When asked would he like to do five shows again, he responded: “I’d like to, but I’d also like to be six foot five and have abs.
“You had 400,000 tickets in one city and one show. There’s no way we are going to do those numbers again. Would I like it? Yes. Is it going to happen? I think it would be impossible.”