ARLINGTON -- An MRI on Brandon Webb's right shoulder showed "some changes in his rotator cuff" and Webb is likely out for the rest of the season.

Webb is weighing his options, and considering having another surgery on his right shoulder.

"I don't think anybody is as disappointed as Brandon is," Rangers general manager Jon Daniels said. "He's going to take a little bit of time and digest the information and decide what his next step is. I think, based on the feedback, it's probably unrealistic that he'll pitch this year in the big leagues. Beyond that, it remains to be seen."

After missing all but one start of 2009 with a right shoulder injury, Webb had surgery on Aug. 3, 2009.

He missed all of 2010 rehabbing, coming back on May 30 for Double-A Frisco. He was scratched before his fifth start of the season and first at Triple-A Round Rock with shoulder discomfort.

After this latest setback, whether Webb will pitch again is in question.

"I had hope that he would [return to form], because I know if he did, what he was capable of bringing to us, but it doesn't look like its going to happen," Rangers manager Ron Washington said. "The key for me is that he gets healthy, for him."

Webb is hardly the first player the Rangers have signed who had an existing injury, and Daniels said that even though Webb did not contribute to the team, it was still a strategy the team will explore.

"Its all about the individual guy," Daniels said. "We knew the risks involved, we did our homework and our due diligence, and you know going in it's not 100 percent it's going to work out. It worked out with Eric Gagne, it worked out with Milton Bradley, it hasn't work out with Brandon Webb, and you understand those things."