"He's been doing more and more baseball, but the running part has still been a problem," Mattingly said. "I think every time they try it, they've gotten some level of tightness."
Mattingly said Puig would be heading to Camelback Ranch, the Dodgers' extended spring training facility, once the team left on its seven-game road trip Friday.
An All-Star in 2014, Puig has appeared in just 11 games so far this season, hitting .279 with two home runs.
Steve Bourbon is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.