Further tests have revealed that Williams suffered a small non-surgical fracture in his back and the wideout is now expected to miss two-to-three weeks, per Lindsey Thiry of ESPN.com.
The Chargers had already downgraded Williams to out for Saturday night's playoff opener against the Jaguars, and it appears he'll miss time beyond this weekend if his team advances. Joshua Palmer and DeAndre Carter should get most of the wideout snaps for Los Angeles alongside Keenan Allen on Saturday and perhaps beyond.