Sebastian Joseph-Day cleared waivers on Christmas Day, closing the book on the $8MM-per-year Chargers contract he signed in 2022. But the veteran interior defensive lineman will not be out of work for long. He is set to head north.

The 49ers agreed to terms with Joseph-Day on Tuesday, according to NFL.com’s Jason McCourty. CBS Sports’ Josina Anderson indicates Joseph-Day is finalizing a one-year deal with the NFC West champions. Joseph-Day will follow Chase Young and Randy Gregory as high-profile 49ers D-line additions this season. To clear a roster spot, the 49ers are waiving wide receiver Willie Snead, who has bounced on and off the team’s practice squad for two years now.

San Francisco has been without longtime starter Arik Armstead for the past three games. Armstead is not on IR, but he is dealing with foot and knee issues after missing much of last season. Javon Hargrave returned to action against the Ravens but missed Week 16 due to injury. Joseph-Day, who started in his final three seasons with the Rams before trekking across town to sign with the Bolts last year, will add some important depth for the 49ers.

Not long after firing Brandon Staley and GM Tom Telesco, the Chargers moved on from Joseph-Day and D-line coach Jay Rodgers. Staley had made a push for a defensive overhaul last year. That led to Joseph-Day and J.C. Jackson joining the team as free agents and Khalil Mack arriving via trade. As the 2023 season winds down, only Mack remains among those pickups. The Chargers traded Jackson back to the Patriots, as that fit proved poor. Joseph-Day, however, started 30 games for the team over the past two years.

Before signing with the Chargers, Joseph-Day generated free agency interest on the heels of his Rams run. A chest injury sidelined Joseph-Day for much of the Rams’ Super Bowl-winning 2021 season, though he did play a few snaps in Super Bowl LVI. But the former sixth-round pick started throughout the 2019 and 2020 seasons alongside Aaron Donald. Pro Football Focus graded Joseph-Day as a top-20 defender in 2020, as the Rams returned to the playoffs and upset the Seahawks in the wild-card round.

This season, the advanced metrics site slotted Joseph-Day 67th overall among interior D-linemen. In Staley’s scheme, Joseph-Day had performed fairly well pressuring QBs. The 28-year-old defender matched his career high with three sacks, and the 11 QB hits accumulated are nearly double his season-best total. Joseph-Day looks set to become a rotational cog in San Francisco, with Armstead’s injury potentially determining how big a role the newcomer will receive. Javon Kinlaw and Kevin Givens round out San Francisco’s interior D-line group.

While a starter for the Rams, Joseph-Day did not eclipse a 43% snap rate in 2019 or 2020. His usage climbed before the 2021 injury, however, and the Chargers used their free agency addition on 71% of their defensive snaps last season. Joseph-Day’s work rate dropped to 58% in L.A. this year.

This will be Joseph-Day’s first time in a 4-3 defense, though the lines between the two primary NFL base fronts have blurred over the past several years. The 49ers have an expensive D-line in place, having extended Nick Bosa after signing Hargrave to a $21MM-per-year deal in March. Armstead remains on the big-ticket extension he signed in 2020. Joseph-Day figures to slot in alongside Gregory as a low-cost veteran; the Broncos are paying the bulk of Gregory’s base salary.