Sports Grant Calcaterra quit football after three concussions. Now, he’s on verge of achieving NFL dream. April 15, 2022April 15, 2022Jori Epstein, USA TODAYComments Off on Grant Calcaterra quit football after three concussions. Now, he’s on verge of achieving NFL dream. At Oklahoma, Grant Calcaterra looked like a surefire future NFL tight end. Then he retired after three concussions. But football pulled him back.