Cole Hamels is scheduled to throw a bullpen session Wednesday at Bright House Field.

Hamels opened camp last month behind schedule after feeling discomfort in his left shoulder in November and the bullpen session would he his first in 11 days.

"I wouldn't say it's painful," Hamels said last week. "I think ultimately when people think about the shoulder and not being able to throw a baseball, they think injuries, tears, the pain indication. It's not that. It's really tired, and it was kind of more difficult to go through the throwing motion, let alone try to throw something very competitive."