Center JC Tretter Retires, Does Not Join the Minnesota Vikings
NFL, NBA, MLB & NHL - Politics & Policy - Axios
Former Browns center J.C. Tretter announces his retirement
JC Tretter retires after interest in playing for Vikings, other teams went unreciprocated - Sports Illustrated Minnesota Vikings News, Analysis and More
Former Browns center JC Tretter retiring after 8 NFL seasons, will stay on as NFLPA president
Sources: NFL discussed cancellations due to COVID-19
Offseason In Review: Cleveland Browns
Former Browns Center JC Tretter Announces Retirement - Sports Illustrated Cleveland Browns News, Analysis and More
The NFL cast JC Tretter out; the NFLPA president says that only makes him more powerful - Sports Illustrated