DENVER (AP) _ Free safety Eric Brown likely is lost for the season because of a knee injury, marking the ninth Denver Broncos' starter to go down with a major injury this season.

Brown partially tore the posterior cruciate ligament in his right knee in Sunday night's 20-17 loss to Seattle, an injury that is expected to sideline him about six weeks.

Brown joins running back Terrell Davis (knee), linebacker John Mobley (knee) and defensive end Alfred Williams (Achilles tendon), all of whom are on injured reserve with season-ending injuries.

In addition, tight end Shannon Sharpe has missed five games because of a broken collarbone and is not expected back until next month. Offensive tackle Tony Jones is out for about three weeks because of a torn triceps, and quarterback Brian Griese has missed the last two games with a tear in his throwing shoulder.

Two other players who were designated as starters _ quarterback Bubby Brister (oblique, knee) and running back Derek Loville (hamstring) _ went down with injuries before they could assume the role.