SAN FRANCISCO -- Defensive end Ray McDonald sat out the final 2 12 quarters of the 49ers' 20-10 victory over the Cleveland Browns on Sunday with a left hamstring strain.McDonald's status for the 49ers' next game, Sunday at the Washington Redskins, was not immediately known. He will be evaluated throughout the week.Third-year player Ricky Jean Francois replaced McDonald for the remainder of the game. McDonald and Jean Francois were credited with one tackle apiece. McDonald ranks fourth on the 49ers with three sacks this season.Tight end Vernon Davis sat out seven snaps in first half when he sustained an injury to his right arm after a 19-yard pass reception. He returned for the next possession and played the remainder of the game in pain, he said."I kind of landed on it wrong," Davis said. "It went numb for a while. It was actually killing me the whole rest of the game. I managed to stay in there and keep it going."Davis said he was not scheduled for an X-ray or an MRI examination because team doctors told him the pain would go away. Davis said he would spend time Sunday night in the hyperbaric chamber at his home.Fullback Bruce Miller sustained an injury to his right thumb but returned to action. There were no other known 49ers injuries in the game.