Running back Frank Gore is expected to return this week despite leaving Sunday's loss to Philadelphia with a strained muscle in his abdomen.

Gore, who rushed for 266 yards and three touchdowns in the 49ers' first three games, was hurt while trying to stretch over the goal line in the third quarter. He fumbled in the process, and Mike Patterson returned it 98 yards for a score.

Rookie tight end Vernon Davis also was hurt on the same play while trying to chase down Patterson. Coach Mike Nolan refused to confirm Davis' post-game declarations he will be out for four weeks with a broken leg, but the sixth overall pick is certain to miss the Niners' next game at Kansas City.

Gore went to a hospital after the game for X-rays, but had no major damage.