Los Angeles Rams quarterback Matthew Stafford exited a joint practice with the Dallas Cowboys early due to hamstring tightness, raising concerns ahead of the upcoming season opener against the Detroit Lions. Stafford, who has had a history of injuries, participated in the first half of practice but was pulled as a precaution. Backup quarterback Jimmy Garoppolo took over the first-team duties for the remainder of the session; however, he will miss the first two regular-season games due to a suspension for violating the NFL's performance-enhancing drug policy. Offensive coordinator Mike LaFleur emphasized the importance of every rep for Stafford, especially given his experience and past success with the Rams, including a Super Bowl victory in his first season. The team is also managing injuries to other key players, including star receiver Puka Nacua and several offensive linemen. While Stafford's exit from practice is concerning, it remains to be seen if it will impact his readiness for the start of the season.