With 400,000 people to entertain this July, the Oklahoma singer may now face possible objections from northside residents who oppose his gigs.
Along with three sell-out One Direction gigs in May, Drumcondra residents now have to contend with five successive Brook's concerts in July.
The Herald has learned that concert organisers are yet to apply to Dublin City Council (DCC) for the special licence needed to stage the concert, as the stadium has permission to stage just three gigs annually.
Last night, residents confirmed they are considering taking a legal injunction in opposition to the Public Event Licence Application required to stage the events.
"The community and residents are disgusted and incensed at the way Croke Park have just increased the number of concerts. There has been no consultation," Patrick Gates of the Croke Park Area Residents Association said.
He added it is "too little, too late", but residents are willing to "meet with them and see what they have to say".
"I know there are a number of people considering taking an injunction" he told the Herald.
"Maybe that is the way – maybe that will help them be more successful.
"We will wait to meet with Croke Park. Every option has to be on the table."
DCC last night confirmed that while Croke Park is permitted to host three concerts a year, permission for additional concerts must be sought through a public event licence.
The council said it had not received one for the Brooks gigs. Organisers have up until 10 weeks prior to the event to apply for the licence, and any input from third parties will be accepted five weeks after the application is made.
Local area representative Ray McAdam has vowed to make an application during this time.
"There will be an opportunity for communities and public representatives to put their observations in, and I will be taking the opportunity to lodge a submission," he said.
He added: "It is a big concern for residents. They have concerns over the policing. There are 400,000 people going to be in their area over the couple of days."
Residents in the Croke Park vicinity said that they were not consulted by concert organisers over the extra dates, and that they did not expect to receive any form of compensation.