49ers place linebacker Ray-Ray Armstrong on IR

The 49ers placed inside linebacker Ray-Ray Armstrong on injured reserve with a pectoral injury he sustained in a 46-27 loss at Carolina on Sunday. In two games, he had eight tackles, two pass breakups, one tackle for a loss, an interception and a fumble recovery in 69 snaps. Hodges has 12 tackles, a sack and a forced fumble in 75 snaps. "It sucks, but I've said all along that we're going to need Wilhoite, we're going to need Gerald to win football games," defensive coordinator Jim O'Neil said. Armstrong, who entered the NFL as an undrafted free agent in 2013, had appeared to have found a home with the 49ers, who claimed him off waivers from the Raiders in November. Rookie guard Joshua Garnett, the No. 28 overall pick, hasn't played an offensive snap in the first two games. "The main thing for him is just to get him reps and get him more and more comfortable with the speed of the game in the NFL," offensive coordinator Curtis Modkins said. Right tackle Anthony Davis (concussion) was riding a stationary bike in the weight room during practice.