Williams suffered a nonsurgical fracture in his back during the Chargers' Week 18 game against the Denver Broncos.
It was a game that had no playoff implications as the Chargers had already locked up their spot, and by playing his starters, head coach Brandon Staley drew criticism about what could have been an avoidable injury.
Responding to that criticism, Staley said he does not look at the situation that way.
"It's difficult to decide who plays and who doesn't and who is more valuable than the rest," he said.
"What you are trying to do is set a standard for your program about how you do things. That is what I believe in, and I didn't want anybody to get hurt in [the game], regardless of their status, because everybody is important."
Williams has caught 63 passes for a team-high 895 yards this season, with a four-game absence due to a high-ankle sprain the only thing stopping him from eclipsing 1000 yards for the third time in four years.