The San Francisco 49ers place nose tackle Ian Williams on the physically unable to perform list.
Williams broke his leg last season against the Seattle Seahawks.
He's had four surgeries on the leg.
It was Williams' first career start when he got injured.
A former Notre Dame player entering his fourth season, Williams has played in six games for the 49ers.
Williams can be activated at any time.
Follow me on Twitter: @RavensInsider
Aaron Wilson covers the Ravens for The Baltimore Sun
Check out our partners at TiqIQ for the best deals on all games on the 2014 NFL schedule.
SEP 12 Football Rumor Mill
Here's what you need to know after 2 weeks of college football.
SEP 11 Jesse Lawrence
Jesse Lawrence takes a look at some affordable NFL action this weekend.
SEP 07 Joel Corry
Can the Seahawks repeat? Are the Chiefs and Panthers ripe for a fall? The NFP takes a look at those questions and more.