San Francisco 49ers cornerback Richard Sherman suffered a Grade 1 hamstring strain, head coach Mike Shanahan told reporters.
Because of the injury, Sherman will sit out of practice this week and miss San Francisco's preseason opener against the Dallas Cowboys on Thursday.
Sherman didn't miss a single game during his first six seasons in the NFL, but it just took one injury to raise big questions over his durability. The four-time Pro Bowler suffered a ruptured Achilles last November that ended his 2017 season and ultimately proved to be the beginning of the end of his Seattle Seahawks career.