FILE - Cleveland Browns center JC Tretter plays against the Houston Texans during the second half of an NFL football game Sept. 19, 2021, in Cleveland. Former Browns and Packers center JC Tretter announced his retirement Thursday, Aug. 25, 2022, after eight seasons in the NFL. Tretter, the current president of the NFL Players Association, only missed one game for Cleveland over the past five seasons despite battling injuries. He said on Twitter that he's decided “to stop playing when I wanted to — on my own terms.” (AP Photo/Ron Schwane, File)