The San Francisco 49ers placed linebacker Kwon Alexander on injured reserve with a torn pectoral, ending his season.
Alexander suffered the injury in the 49ers' Week 9 win over the Arizona Cardinals last Thursday. It's a downgrade for the NFL's top-rated defense through eight games (241.0 yards allowed per game). The 49ers take on the Seattle Seahawks at home on Monday night in Week 10.
The 49ers D/ST is 8th in numberFire's Week 10 fantasy rankings.
Source: 49ers.com