Willis signed with the Raiders on Monday, Field Yates of ESPN reports.

Willis (undisclosed) was reinstated to the 53-man roster Saturday, Field Yates of ESPN reports.

San Francisco designated Willis (undisclosed) for return from injured reserve Wednesday.

Willis (undisclosed) was placed on the 49ers' injured reserve Wednesday.

Willis signed a one-year contract with the 49ers on Wednesday.

Willis (ankle) is active for Saturday against the Packers, Nick Wagoner of ESPN.com reports.

Willis (ankle) is questionable to play Saturday versus the Packers.

Willis suffered a high-ankle sprain during Sunday's wild-card win over the Cowboys and is unlikely to play Saturday against the Packers, Matt Barrows of The Athletic reports.

Willis was activated from the reserve/suspended list Monday, Matt Maiocco of NBC Sports Bay Area reports.