The 49ers’ defense was dealt another crippling blow on Sunday when Fred Warner suffered a fractured and dislocated ankle. His recovery process will begin soon. 
Warner is scheduled to undergo surgery tomorrow, Matt Maiocco of NBC Sports Bay area notes. When speaking about the injury, head coach Kyle Shanahan added he expects the four-time Pro Bowler to return to on-field activities at some point during the offseason. While a more definitive timeline will depend on the success of the procedure, the 49ers will move forward without one of their most important contributors for the rest of the season.
Over the course of his career (all of which has taken place with San Francisco), Warner has served as a full-time starter and a consistent high-end performer. The four-time All-Pro recorded between 118 and 137 tackles in each of his first seven seasons with the 49ers, but this injury will cause an absence beyond one game for the first time in Warner’s decorated tenure. With edge rusher Nick Bosa already sidelined, San Francisco’s defense faces a major challenge in terms of keeping the team in playoff contention.
General manager John Lynch has made it clear a trade is being worked on to acquire a pass rusher capable of replacing Bosa’s presence to an extent. It will be interesting to see if the 49ers – who lost Dre Greenlaw in free agency – will add linebacker to their list of positions targeted on the trade front. As ESPN’s Nick Wagoner writes, though, the loss of Warner hinders San Francisco’s chances of competing for a Super Bowl in 2025. Parting ways with future draft capital for a rental addition could therefore prove to be a misstep.
In any event, the 49ers are currently in position to lean on internal options as they look to replace Warner. That could result in Tatum Bethune taking on a starting defensive role moving forward. The 2024 seventh-rounder has operated as a regular on special teams over the course of his first two seasons in the league. Bethune only logged 51 snaps on defense as a rookie, however, and his total in that regard sits at 48 after he filled in for Warner in Week 6. The 49ers’ plan regarding any LB moves will be based in part on how Bethune fares in his expanded role.
Sunday’s loss leaves San Francisco as one of three teams in the NFC West with a 4-2 record. Plenty of time remains for the team’s season to swing one way or the other as a result. Ahead of the 2026 campaign, though, Warner’s progress in rehabbing after surgery will be a key story to follow.