The Dolphins have released Sanu, according to Tom Pelissero of NFL Network.

Sanu signed a contract with the Dolphins on Tuesday, Adam Schefter of ESPN reports.

Sanu (coach's decision) is listed as inactive for Sunday's NFC Championship at the Rams, Nick Wagoner of ESPN.com reports.

Sanu (knee) wasn't listed on the 49ers' injury report Wednesday, Eric Branch of the San Francisco Chronicle reports.

The 49ers activated Sanu (knee) from injured reserve Wednesday, Cam Inman of The San Jose Mercury News reports.

Sanu (knee) being activated from IR wasn't among the transactions made by the 49ers in advance of Saturday night's playoff game against the Packers.

Sanu (knee) being activated from injured reserve wasn't among the transactions made by the 49ers ahead of Sunday's wild-card game at Dallas.

Sanu (knee) wasn't among the players added to San Francisco's roster Saturday ahead of Sunday's regular-season finale against the Rams, Cam Inman of The San Jose Mercury News reports.

The 49ers designated Sanu (knee) for return from injured reserve Wednesday.

The 49ers placed Sanu (knee) on injured reserve Monday.