By signing Cliff Lee last fall, the Philadelphia Phillies became the National League’s favorite to win a third pennant in four seasons.

With their awesome staff, a stacked lineup and a great closer, they looked almost unbeatable. But the spring hasn’t been kind to the Phils. The injury bug has caused some concern heading into the 2011 season.

Brad Lidge is out for at least three-to-six weeks with a rotator cuff sprain, while Chase Utley, Placido Polanco and Domonic Brown have been hampered by injuries, as well.

But Philadelphia isn’t the only team to see their roster face some doubts this past week. Inside we’ll take a look at what changes have hit, those on the horizon and how that will effect the club’s outlook for 2011.

Read more MLB news on BleacherReport.com