Forrest Gregg diagnosed with Parkinson's disease

Former Green Bay Packers offensive lineman and Cincinnati Bengals head coach Forrest Gregg announced Wednesday that he has been diagnosed with Parkninson's disease.

Gregg is currently being treated at the Colorado Neurological Institute.

The Hall of Fame tackle was nicknamed "Iron Man" for playing in a then-record 188 consecutive games. Gregg played for the Packers during their initial glory years from 1956-1970 and won six NFL Championships. He finished his career as a Cowboy in 1971.

The 78-year-old coached the Bengals from 1980-1983 and guided the franchise to Super Bowl XVI following the 1981 campaign where the Bengals fell to the 49ers, 26-21.

Gregg's 34-27 mark -- including playoffs -- at Cincinnati is the highest winning percentage in club history.

The Texas native holds a 75-85-1 mark as an NFL head coach, which also included stops in Cleveland (1975-77) and Green Bay (1984-87).