Ansah (biceps) was placed on injured reserve Saturday, Nick Wagoner of ESPN.com reports.
Ansah has officially been diagnosed with a biceps tear, David Lombardi of The Athletic reports.
There are fears that Ansah (arm) suffered a season-ending biceps tear in Sunday's loss to the Eagles, Ian Rapoport of NFL Network reports.
Ansah (arm) has been ruled out for the rest of Sunday's game against the Eagles.
The 49ers signed Ansah to a one-year contract on Wednesday.
Ansah will sign with the 49ers this week, Connor Hughes of The Athletic reports.
Ansah (neck) finished the 2019 season with 19 tackles, 2.5 sacks, two pass breakups and two forced fumbles over 11 regular-season games.
Ansah (neck) won't play in Sunday's NFC Divisional matchup against Green Bay.
The Seahawks have listed Ansah (neck) as questionable ahead of Sunday's game versus the Packers, John Boyle of the Seahawks' official site reports.
Ansah (neck) was a non-participant at Thursday's practice, John Boyle of the Seahawks' official site reports.