FILE - Cleveland Browns center Alex Mack (55) of the AFC is congratulated by teammates after scoring a fourth quarter touchdown in the NFL Pro Bowl football game, Sunday, Jan. 30, 2011 in Honolulu. Seven-time Pro Bowl center Alex Mack is retiring after 13 years in the NFL, leaving a major hole in the middle of the offensive line for the San Francisco 49ers. The 36-year-old Mack announced his retirement on Friday, June 3, 2022, in a move the Niners had been bracing for this offseason. (AP Photo/ Marco Garcia, File)