"I think players sometimes don't want the manager to know they are getting treatment," Johnson said. "But I need that. It's part of the information I could use to ensure that they can get through the year injury free. They might be able to play with that injury, but it might be better to take a day off and let somebody else [play]."
Johnson plans to give Harper the day off Wednesday, and the team has a day off Thursday.
Harper didn't have any issues with the hip on Tuesday, going 0-for-5 and scoring two runs.
Bill Ladson is a reporter for MLB.com and writes an MLBlog, All Nats All the time. He also could be found on Twitter @WashinNats. This story was not subject to the approval of Major League Baseball or its clubs.