SANTA CLARA – The 49ers open their week of preparations to face the Detroit Lions with few assurances of who will be available to start at right guard.
Starter Mike Person sustained a foot strain that forced him out of action in the second quarter of the 49ers' opener on Sunday against the Minnesota Vikings. His backup, Joshua Garnett, was carted off the field in the third quarter with an injury coach Kyle Shanahan described as a dislocated toe.
Neither injury is considered a long-term injury, Shanahan said on Monday. But it is unknown whether either player will be available to face the Lions on Sunday at Levi’s Stadium.