Cleveland Browns center J.C. Tretter on course for Sunday
Browns center JC Tretter appears ready to begin season
Should signing J.C. Tretter be the Ravens' next move? - Baltimore
NFL World Reacts To Veteran Player Retirement News - The Spun
Nick Harris Ready To Take Over For J.C. Tretter, Who Has Offered
J.C. Tretter elected president of NFL players' union amid CBA disarray
JC Tretter returns to practice for Browns - NBC Sports
Browns Tretter back at practice, Mayfield better behind scenes
NFLPA president uses Ivy League schooling and on-field experience