Erik Armstead announced on Tuesday that he will undergo surgery for a torn meniscus.
Armstead will miss most, if not all, of the 49ers’ offseason work programs but should be good to go come training camp. The veteran defensive tackle, who played in all three of the 49ers’ postseason contests, said he suffered the injury in Week 13 against the Eagles. Armstead totaled 27 tackles and five sacks this season and also recorded a sack of Patrick Mahomes in the Super Bowl.