FILE - In this Dec. 15, 2019, file photo, Cleveland Browns center JC Tretter (64) lines up against the Arizona Cardinals during the first half of an NFL football game in Glendale, Ariz. Browns starting center JC Tretter returned to practice Monday, Sept. 7, 2020, after being sidelined for all of training camp after having knee surgery. Coach Kevin Stefanski said Tretter, the NFLPA President, was back on the field as the Browns began preparing for Sunday's season opener at Baltimore. (AP Photo/Rick Scuteri, File)
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