Injured Washington Nationals outfielder Bryce Harper will begin a rehab assignment with Class A Potomac Nationals on Tuesday.
Nationals manager Davey Johnson said before Friday night's game against the Colorado Rockies that Harper is progressing in his recovery from bursitis in his left knee but refused to put a time frame on a return.
"Knowing Harp, he probably won't need much (time in the minors)," Johnson said. "It's not so much timing as it is just seeing how he feels and how the knee holds up to being out there for nine innings."
Harper hit in an indoor cage on Friday and is expected to practice in the outfield this weekend. He'll remain with the Nationals through Monday before heading to Potomac.
The 20-year-old injured the knee when he ran into an outfield wall on April 30 in Atlanta and then again in Los Angeles in a game against the Dodgers on May 13.
Harper is hitting .287 with 12 homers and 23 RBI in 44 games this season.