Armstead had been dealing with a shoulder injury since training camp. He managed to play through the pain, although he didn’t rule out the possibility of surgery in the upcoming offseason, per Niners Wire’s Chris Biderman.
The second-year pro reaggravated his shoulder during San Francisco’s 41-23 loss to the New Orleans Saints in Week 9. He was forced to come out of the game and did not return.
Armstead had started four games this season and played in all eight, registering nine tackles and 2.5 sacks. Pro Football Focus gave him a 44.1 grade on the season, and his run-stopping issues are the primary reason why the number is low.
In a corresponding move, the Niners signed defensive tackle Chris Jones off waivers from the Miami Dolphins, per Kyed.
San Francisco has already dealt with a slew of injuries this season. Linebacker NaVorro Bowman is out, as is fellow LB Ray-Ray Armstrong. Running back Carlos Hyde also missed his second consecutive game on Sunday.
But, at 1-7, shelving the promising-yet-raw talent might be the best thing for his career. Armstead needs to rehabilitate his shoulder as much as possible this upcoming offseason and be 100 percent in 2017.