He suffered two concussions in '09 and has talked about being worried about his long-term health. But I wouldn't expect any type of retirement announcement in the near future. Westbrook will one day retire as an Eagle, but he'll likely try to sign with another team. The Eagles are probably doing him a favor (much like what the Chargers did for LaDainian Tomlinson) by releasing him this early in the offseason.
There was at least one report in Philadelphia that Westbrook wouldn't be able to pass another team's physical because of a past knee injury. That report was disputed by Westbrook and his representatives. Eagles coach Andy Reid will meet with reporters at 3 pm ET.
But no matter what the future holds, Westbrook has been a huge part of the Eagles organization. He wasn't as beloved as Brian Dawkins, but fans appreciated the way he played through injuries while putting up huge numbers.
He caused teams such as the Giants to go out and sign players specifically to cover him. Whether or not this is the end of the road for Westbrook, he'll be considered one of the best players to ever play for the Eagles. Sad day in Philly.