Los Angeles Rams quarterback Matthew Stafford experienced hamstring tightness and did not finish Wednesday's joint practice against the Dallas Cowboys, Sarah Barshop of ESPN reports

Rams quarterbacks Jimmy Garoppolo and Stetson Bennett took over reps for approximately the second half of the practice as Stafford, 36, watched from the sideline.

"[Stafford] operates at a world-class level," offensive coordinator Mike LaFleur said. "But we know that every rep is going to be valuable for him, no matter how many plays he's had. Unfortunately, he had some tightness."

Garoppolo, who signed with Los Angeles in March to back up Stafford, worked with the first-team offense after Stafford's exit, the reps having added significance as Garoppolo is unlikely to play in the preseason games.

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