Seventeen NFL teams began mandatory minicamp workouts Monday, providing the first real glimpse of rookie performances and quarterback competitions ahead of training camps. The Buffalo Bills are installing a new defensive scheme under coordinator Jim Leonhard, while injury concerns linger with players like DT Ed Oliver limited in OTAs.

Patrick Mahomes leads the Kansas City Chiefs' storyline as he recovers from left knee surgery, with increased practice workload expected. Meanwhile, the Las Vegas Raiders face a quarterback decision between Kirk Cousins, Aidan O'Connell, and rookie Fernando Mendoza. The Cleveland Browns' quarterback competition between Deshaun Watson and Shedeur Sanders enters its final evaluation phase.

New England's Christian Gonzalez faces a contract situation that could impact his minicamp participation, creating tension between business and team chemistry. The Houston Texans seek explosive plays from their offense under Nick Caley, while Indianapolis transitions with multiple young defensive starters including CJ Allen and A.J. Haulcy.

Jacksonville experiments with multiple tight end formations featuring Nate Boerkircher and Tanner Koziol. These sessions reveal roster battles and scheme implementations that directly impact Week 1 preparations, with coaches making critical personnel decisions before the July training camp break.