"Joc will come back after the break, yes, but how soon after the break is uncertain," said Roberts. "He hasn't swung a bat yet. He's moving around in Arizona [Camelback Ranch training complex]. The soreness has dissipated. When he comes back is uncertain."
Roberts' update on Kershaw was similar.
"He'll need time after [the All-Star break]," Roberts said. "Every day he seems to feel better, the activity increases, and so the sooner the better, but we're still reluctant to put any timetable on it. We want to make sure we put him in the best position to stay healthy."
Roberts said Hyun-Jin Ryu, who on Thursday night made his first start since last year's shoulder surgery, came out of it "with just the normal soreness after a start."
Ryu's velocity dropped in the fifth inning, Ryu's last, and Roberts said the club is challenged with trying to win on days he starts while he rebuilds the strength and stamina.
"That's the balance," he said. "With Ryu, his velocity right around 80-pitch mark hit that fatigue factor. As time goes on with bullpen sessions, you expect the velocity to hold and be the normal velocity. We've got to be mindful of that, and we've got to win games. When the stuff starts to dip, that's a big red flag for me."
Roberts said the starting rotation has not been set for the resumption of play after the All-Star break. The current starting rotation of Ryu, Kenta Maeda, Scott Kazmir, Brandon McCarthy and Bud Norris won a combined three games for the Dodgers last year, all by McCarthy.
• The Dodgers received right-handed pitcher Alec Grosser, 21, from Atlanta to complete the June 30 trade that saw Los Angeles acquire Norris.
Ken Gurnick has covered the Dodgers since 1989, and for MLB.com since 2001. This story was not subject to the approval of Major League Baseball or its clubs.