Keenan Allen out Saturday with ankle, collarbone injuries

Keenan Allen, San Diego's top receiving target and Philip Rivers' most reliable possession receiver, left last Sunday's game against the Broncos after injuring his ankle fighting for extra yards after a reception. While the ankle injury ended Allen's afternoon, the team announced Tuesday that the former Cal Bear had also broken his collarbone against Denver, putting his status for Saturday's game in Santa Clara in doubt.

Allen, a third-round selection by the Chargers last year, has followed his stellar rookie season with a solid sophomore campaign, leading San Diego with 77 catches and 783 yards. The receiver has also shown a knack for third down efficiency, ranking second on the squad with 19 grabs for 216 yards. Allen only has four touchdown receptions on the year but his two scores in Baltimore a couple weeks ago helped launch San Diego back into the playoff conversation.

With Allen likely out Saturday, Seyi Ajirotutu will be given more playing time, and former CFL star Dontrelle Inman may even see his first NFL action against the 49ers.