Williams recorded two tackles (one solo) and an interception during Thursday's 12-6 win at San Francisco.
The Rams activated Williams (hamstring) from injured reserve Saturday.
Williams (hamstring) was designated to return from injured reserve Wednesday.
Head coach Sean McVay told reporters Monday that Williams (hamstring) is expected to return to practice and have his 21-day window opened this week, Cameron DaSilva of USA Today reports.
Coach Sean McVay said Friday "the hope" is Williams (hamstring) will be ready to come off IR and play Week 5, Sarah Barshop of ESPN.com reports.
The Rams placed Williams (hamstring) on injured reserve Thursday.
Williams (hamstring) was a limited participant at the Rams' practice Wednesday, Sarah Barshop of ESPN.com reports.
Williams (hamstring) returned to practice Monday, Stu Jackson of the Rams' official site reports.
Head coach Sean McVay relayed Thursday that he expects Williams (hamstring) to "work back in" to practice next week.
Williams suffered a hamstring strain in practice Thursday and will be monitored daily, Gary Klein of the Los Angeles Times reports.