Diaz (elbow) will begin a rehab assignment at Single-A Ontario on Saturday, Katie Woo of The Athletic reports.
Diaz began facing hitters in live batting practice last weekend and is now ready for the final step in his rehab from the elbow surgery he underwent in April. It's unclear exactly how many minor-league reps the Dodgers want the 32-year-old closer to get before he rejoins the team, but he seems to be on track to return to the big-league bullpen shortly after the All-Star break.