"That essentially means he's dealing with a partial tear within the ankle," wrote Myles Simmons of Pro Football Talk.
Williams did not practice this past week, was listed as "questionable" for Sunday's game and was considered a game-time decision.
Kickoff between the 49ers and Rams is scheduled for 3:40 p.m. PT. A return to SoFi Stadium in two weeks for Super Bowl LVI is on the line.
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