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49ers’ Mykel Williams Out for Season With Torn ACL, Lateral Meniscus Tear

The diagnosis forces a shorthanded San Francisco defense to weigh roster moves before the NFL trade deadline.

Overview

  • Team testing on Monday confirmed the rookie’s torn ACL and lateral meniscus in his right knee, with surgery ahead and a 2026 return timeline.
  • Williams was hurt late in the win at the Giants while pressuring Jaxson Dart at MetLife Stadium, renewing scrutiny of the surface as the league cites favorable injury data.
  • The No. 11 pick started all nine games, working early downs on the edge and sliding inside on passing downs, and posted roughly 20 tackles and one sack.
  • The loss deepens an already depleted unit that has Nick Bosa and Fred Warner out for the season, Yetur Gross-Matos on injured reserve, and Bryce Huff expected back after two missed games.
  • With depth stretched at defensive end, San Francisco is leaning on Sam Okuayinonu, Robert Beal Jr., Keion White and recent call-up Clelin Ferrell as the front office evaluates trade options before Tuesday.