Chargers' Allen has broken collarbone

San Diego, CA (SportsNetwork.com) - San Diego Chargers wide receiver Keenan Allen has a broken collarbone and injured ankle and is not expected to play Saturday against the San Francisco 49ers.

The Chargers didn't announce when Allen suffered the collarbone injury, but he left Sunday's game against Denver with the ankle injury.

Allen leads the Chargers with 77 receptions for 783 yards and has four touchdowns this season.