Philadelphia, PA -- (Sports Network) - Philadelphia Eagles running back Brian Westbrook missed practice again on Thursday in preparation for the upcoming game against San Francisco.

Westbrook, who has been hampered by a sprained ankle he suffered in the Week 3 victory over Pittsburgh, suffered fractured ribs in Sunday's 23-17 loss against Washington and his status for this week's game remains uncertain.

An MRI exam on Monday showed the injury, which occurred in the first quarter. Despite the injury, Westbrook finished the game with 33 yards on 12 carries and a touchdown and a team-best six catches for 51 yards.

In four games this season for the 2-3 Eagles, Westbrook has run for 194 yards and four touchdowns on 54 carries. He is also the team's second-leading receiver with 14 catches for 97 yards and two scores.

In addition to Westbrook, guard Shawn Andrews, who has missed the past three games with a back injury, defensive end Juqua Parker, who has a knee injury, and safety J.R. Reed, who has been bothered by a troublesome hamstring and ankle, did not practice.

Wide receiver Reggie Brown also was absent from the practice field with a groin injury. He had received only limited reps on Wednesday.

Wide receiver Kevin Curtis, who has yet to play this season after undergoing surgery in August for a sports hernia, was a full participant in practice for a second straight day.