Legendary Bengals quarterback Boomer Esiason says he 'most likely' has CTE, as does anyone else who's played football.

The 56-year-old former football player said Monday morning that if he died tomorrow and his brain was donated to science, it would probably show signs of chronic traumatic encephalopathy.

'I think all football players probably have it, the way I read, the way I see it,' Esiason said on his radio show Boomer and Carton.

CTE is a degenerative brain disease caused by repeated blows to the head. Over time, these hard impacts result in confusion, depression and eventually dementia.

Currently it can only be diagnosed after the sufferer has died, by looking at the brain.