"We haven't made a decision on what's going to happen or which route we're going to take, as far as getting him back on the mound," Reds manager Bryan Price said. "I don't think we're going to be talking about this in a week or two weeks and still have everything up in the air. A decision will need to be made so we can focus on that option."
The Parra DL move is retroactive to Friday, a day after he allowed an unearned run on two hits in one inning vs. Milwaukee. There wasn't a specific pitch or incident that caused his neck to start hurting.
"It was just wake up, turn my head a certain way and feel a catch all of a sudden," Parra said. "Maybe it was from sleeping."
Parra, who endured some back and neck issues last season, is optimistic he will resume pitching soon. He will not be traveling with the club during at least the upcoming four-game series in Atlanta.
"It comes and goes. Hopefully with some work and getting on a regimen, I'll be able to prevent it from happening," said Parra, who can be activated May 9. "I don't expect it to be any longer than it has to. I'm feeling a lot better today, but we have to make sure we have enough arms."
The Reds called up right-handed reliever Carlos Contreras on Monday to take Bailey's spot on the roster. Having Contreras keeps the bullpen from being short-handed.
"I think it just made sense to put [Parra] on the DL and get him right, leave him here, get treatment and when he's ready to start throwing, he can rejoin us and get back in touch with his pitching," Price said.
Mark Sheldon is a reporter for MLB.com. Read his blog, Mark My Word, and follow him on Twitter @m_sheldon. This story was not subject to the approval of Major League Baseball or its clubs.