John Gregory Clay (born May 1, 1964) is an American former professional football player who was an offensive tackle in the National Football League (NFL) for two seasons during the late 1980s. Clay was born in St. Louis, Missouri, and played scholastically at Northwest High School in Cedar Hill. He played college football for the University of Missouri, where he was a three-time All-American. He was a third-team selection as a sophomore, second-team as a junior, and earned consensus first-team honors as a senior. He was selected by the Los Angeles Raiders in the first round (15th pick overall) of the 1987 NFL draft. After his rookie season, the Raiders traded Clay to the San Diego Chargers in exchange for star offensive lineman Jim Lachey. On 1/5/2016, John Gregory Clay was officially named as the head coach of the Cahokia Comanche football team.