GAA president Christy Cooney has described the decision to erect a nine-foot barrier on Hill 16 to prevent pitch invasions at this year's All-Ireland final as a "last resort".
"We didn't want to have to do this, but we're left with no other option. For the safety of players, officials and patrons, this has become necessary," he said.
"If you look at last year's All-Ireland final, the break came from the Hill, no place else. If the break hadn't come from the Hill, nobody else would have moved in the stadium.
"That was clearly obvious from all the research we've done and all the video evidence we have. It led us to believe that if we can control it there, we can control it everywhere else."