Mark Gastineau, one of the NFL's most feared pass-rushers as a member of the New York Jets in the 1980s, says he's battling serious brain issues he believes were caused by concussions in football.

"When my results came back, I had dementia, Alzheimer's and Parkinson," Gastineau said. "Those are three things that I have."

Gastineau, 60, said he was diagnosed a year ago and he blames it on poor tackling technique.

He became a professional boxer after football. From 1991 to 1995, he fought a total of 17 professional bouts, winning 15.