San Francisco 49ers offensive lineman Joe Staley suffered a knee injury in the first half of Sunday's preseason game against the Minnesota Vikings.
Matt Maiocco of NBC Sports Bay Area reported the news and noted Staley would not return to the contest.
According to Cam Inman of the Mercury News, John Theus played left tackle after Staley exited. Inman also pointed out it didn't seem like a particularly worrisome setback on the sideline:
Cam Inman#49ers Joe Staley won't return to this game.