SAN FRANCISCO -- Patrick Willis is an active San Francisco 49er again.The star inside linebacker is expected to start. He hasn't played since Week 3 against the Colts when he suffered a groin injury. Defensive lineman Ray McDonald is also active as expected. He suffered a biceps injury last week and did not practice Wednesday and Thursday. But the team doesn't think he is at risk of suffering further damage to the bicep if he continues to play.