Nationals Manager Matt Williams opted against placing the two-time All-Star outfielder on the disabled list but didn't rule out the possibility of ultimately making that move to ensure the long-term health of the team's best hitter.
"He's sore," Williams said. "We're evaluating every day, and we'll take the appropriate steps necessary to make sure that he's 100% ready to go when he's ready to go."
Harper received medical treatment Friday and was going to attempt to take some practice swings. He did not speak to reporters.
Harper slipped on damp grass in the sixth inning Thursday night against Tampa Bay and gingerly walked off the field.