49ers vs. Dolphins injury report: Demarcus Dobbs on crutches after knee injury

The San Francisco 49ers lost a key reserve Sunday when two-way player Demarcus Dobbs left the game in the first quarter with a knee injury and did not return.

Dobbs' injury reportedly didn't look too severe, but he was quickly ruled out for the remainder of the game, which means that doctors might have sensed some severity. Dobbs, who was sporting crutches in the locker room, is expected to have an MRI Monday, but head coach Jim Harbaugh already encouragingly stated that the versatile athlete "dodged a bullet," according to Eric Branch of the San Francisco Chronicle.

Dobbs has been the 49ers' third tight end and a backup across the defensive line along with providing some big-time special teams play throughout the 2012 season. The 25-year-old second-year player was also recently arrested for marijuana possession and a suspected DUI after he was involved in a single-car accident last Friday. Dobbs did not travel with the team to St. Louis for the game that weekend.

Check back with SB Nation Bay Area for more injury updates throughout the day.