Williams was downgraded to out Friday by the Chargers, who said the wide receiver would remain in Los Angeles to continue receiving treatment.
The sixth-year receiver had not practiced all week after suffering a contusion in his back in the regular-season finale against the Denver Broncos. Coach Brandon Staley said Thursday that an MRI was negative, not showing any fracture or muscle injury.
A 2017 first-round draft pick, Williams has caught 63 passes for a team-high 895 yards and four touchdowns this season. He missed four games with a high ankle sprain, and he paired up with Keenan Allen in only four complete games in 2022. The Chargers were 4-0 in those contests.
The fifth-seeded Chargers (10-7) are making their first playoff appearance since 2018.
Information from ESPN’s Lindsey Thiry was used in this report.