Peralta (thigh) has been throwing off a mound, per MLB.com.
Peralta has been on the 15-day injured list since July 12 due to a left adductor strain. It's uncertain how much longer the veteran reliever will be out, but manager Mike Shildt recently indicated that Peralta is "in a good place." Prior to being sidelined, Peralta posted a 4.50 ERA, 1.29 WHIP and 20:12 K:BB over 34 innings while notching two wins and 11 holds across 41 appearances.