Mario Manningham done for season for San Francisco 49ers

  • Updated: Dec. 24, 2012 at 11:13 p.m.

San Francisco 49ers wide receiver Mario Manningham is done for the season after tearing the ACL and PCL in his left knee during Sunday night's 42-13 loss to the Seattle Seahawks, a source who has spoken with the player told's Albert Breer.

Manningham had an MRI on Monday after X-rays on his knee were negative.

Manningham ranks third on the 49ers with 449 receiving yards on the season. The fifth-year pro out of Michigan missed two games earlier this month because of a shoulder injury.

He wasn't the only 49ers player to suffer a significant injury Sunday.

Pro Bowl tight end Vernon Davis suffered a concussion and must follow the NFL's concussion protocol before being cleared to play in the 49ers' regular-season finale against the Arizona Cardinals.