49ers place Javon Hargrave, Curtis Robinson on IR

San Francisco's early-season injury bug has resulted in two more players landing on injured reserve.On Saturday, the 49ers placed defensive tackle Javon Hargrave and linebacker Curtis Robinson on IR.Robinson suffered a torn ACL this week; he'll be done for the year. Hargrave has a torn triceps. It's reportedly season-ending, too.Said coach Kyle Shanahan on Monday, regarding the Hargrave injury: "It's a big one and I thought he had his best game [against the Rams]. I thought he was a huge factor."The 49ers signed defensive lineman Sam Okuayinonu from the practice squad. They also elevated for Sunday defensive lineman Evan Anderson and safety Jaylen Mahoney.The 1-2 49ers host the 1-2 Patriots on Sunday.