Michael Brantley is expressing frustration with the setback in his return from surgery on his right shoulder.

The outfielder is out indefinitely for the Houston Astros.

"As a competitor, you want to be out there with your team," Brantley said. "I love these guys. I love this organization. No one is more disappointed than myself. But at the same time, I'll continue to put in the work, keep my head down and be the best teammate I can and work as hard as I can."

Brantley has yet to play in the Major Leagues this season. He appeared to be close to returning, but Dusty Baker said Friday that Brantley will be shut down "for a while." An MRI revealed inflammation in his surgically repaired shoulder.

"Very frustrating. You rehab all offseason, put in the work every single day and do everything the right way and sometimes it just doesn't work out to your favor," Brantley said. "But at the same time, I won't stop. I'll keep my head down, continue to keep working and be out there as soon as I can with these guys."