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.

Three-time All-Pro safety Tyrann Mathieu announced in a post on his Instagram page that he is retiring from the NFL. The 33-year-old defensive back was entering his fourth season with the New Orleans Saints but won't step onto the field this year.

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