Mayo's Aidan O'Shea revealed yesterday that he has suffered concussion "six or seven times" in his career.
He admitted that he returned to the field of play during last year's All-Ireland semi-final replay against Kerry "a little groggy" after his collision with colleague Cillian O'Connor.
Mayo were satisfied on that occasion, however, that he had not suffered concussion and had left him out of the action for a long period of observation before he was allowed resume.
O'Shea said he felt fine at the time of his second-half re-entry but admitted that, in hindsight, he wasn't "100pc."
Concussion in sport in becoming a major topic of discussion, with Irish rugby international Johnny Sexton's 12-week break because of a fourth concussion again highlighting the dangers.
O'Shea has also suggested that Mayo will have to curb their propensity for all-out attack if they are to protect the big leads they have the capacity to amass.
He has also welcomed Keith Higgins' appointment as captain and has described him as Mayo's greatest ever footballer.
I spent a few weeks in the States recently and I will probably have to spend a few more there in the Betty Ford Clinic as I am hooked on the NFL and US college football. If I could get just a game with a 60-minute play clock and no ads I would watch it 24/7.