The main topic across the NFL this week has been the start of training camp for many teams, with the Houston Texans kicking off their camp on July 23. Former Texans safety Tyrann Mathieu was one of these players.

New Orleans Saints safety Tyrann Mathieu joins 'The Insiders' after announcing his retirement from the league.

Tyrann Mathieu isn't completely closing the door on a return to the NFL, but for now, the former Super Bowl champion and three-time first-team All-Pro remains confident in his decision after announcing his retirement Tuesday.