The 49ers' Justin Smith reportedly has a partially torn triceps. (David Welker/Getty Images)
San Francisco 49ers defensive end Justin Smith has a partially torn triceps, Matt Barrows of The Sacramento Bee reported on Thursday. Barrows reported that Smith will likely need surgery in the offseason.
Smith, who suffered the injury in the 49ers' Dec. 16 game against the New England Patriots, has not practiced or played since. Smith missed last weekend's game against the Seattle Seahawks with what the 49ers called an elbow injury.
He is listed as questionable for Sunday's regular-season finale against the Arizona Cardinals.
The 49ers (10-4-1) can clinch the NFC West division title with a win Sunday against the Cardinals. San Francisco could also earn a first-round with a win and a Green Bay Packers loss.
Smith has been one of the cornerstones of the 49ers defense over the past five seasons, though his production is slightly down this year. He has 66 tackles and three sacks in 14 games.