The 49ers' defensive line got a much-needed boost Tuesday with the return of nose tackle Ian Williams from the Physically Unable to Perform list.
Williams went back on the PUP list in July while still recovering from four ankle surgeries. Williams suffered a season-ending broken ankle on a legal cut block in the 49ers' Week 2 game at Seattle last September.
The 49ers practiced with just just five defensive linemen earlier this week.
Williams made the 49ers roster in 2011 as an undrafted free agent out of Notre Dame.