De La Rosa (elbow) threw 40 pitches to rehabbing teammates A.J. Pollock and Chris Herrmann on Tuesday, Jake Rill of MLB.com reports.
The 27-year-old De La Rosa, who's been out since May 25, used his fastball, slider and changeup during the session. Diamondbacks manager Chip Hale said De La Rosa may throw batting practice one more time before heading out on a rehab assignment.