SANTA CLARA -- Defensive end Ray McDonald's status for the 49ers' game on Sunday against the Washington Redskins remains uncertain.McDonald sustained a left hamstring strain in the second quarter of the 49ers' victory over the Cleveland Browns at Candlestick Park and did not return to action."We'll see," 49ers coach Jim Harbaugh said Monday during his weekly press conference. "I haven't talked to Ray, yet, today. We'll find out where he's at. As we always do, he'll be working through it and we'll find out where he's at after a couple days."The 49ers return to practice Wednesday to begin their on-field preparations to face the Redskins.McDonald's injury is believed to be similar to the hamstring strain that outside linebacker Parys Haralson sustained Oct. 16 against the Detroit Lions. Haralson did not return to action in the second half against the Lions. When the 49ers returned after the bye week, he played without any limitation Sunday against the Browns.McDonald appeared to sustain the injury as he applied pressure to Browns quarterback Colt McCoy. McDonald chased McCoy toward the sideline on a third-down incomplete pass. En route to the 49ers' sideline on the other side, McDonald went to the ground in the middle of the field.He did not return to action. Ricky Jean Francois played left defensive end in McDonald's absence.Harbaugh said receiver Braylon Edwards seemed to make it through the game unscathed. Edwards returned to action after sustaining a torn meniscus in his right knee on Sept. 18 against the Dallas Cowboys. Edwards caught four passes for 42 yards.Fullback Bruce Miller said he was fine after sustaining a right thumb injury Sunday. He left Candlestick Park with a brace on his thumb. But he reported no issues on Monday."The thumb is great, a little bit sore," Miller said. "But if the thumb is the biggest problem we have, I think we're good."