NFL notable players who retired early: Ali Marpet joins list of those who stepped away in their prime
Gronk retiring after 11 NFL seasons, 4 Super Bowl titles
Purdy elbow surgery could happen next week
In year two out of retirement, Rob Gronkowski ready to go “full speed” - Bucs Nation
Rob Gronkowski Retires from NFL After 11-Year Career with Patriots, Buccaneers, News, Scores, Highlights, Stats, and Rumors
Rob Gronkowski retires again, but could make another comeback in 2022 or 2023, agent says (report)
Rob Gronkowski Announces NFL Retirement for Second Time (UPDATE)
Mohegan Sun to host Rob Gronkowski's retirement party
21 Athletes Who Retired Earlier Than Expected
Rob Gronkowski Made $70 Million In NFL Salary But Never Spent It—Here's How - Sports Illustrated