Rodriguez underwent surgery Wednesday to repair the labrum in his left hip, Kevin Gorman of TribLive.com reports.
Darvish (elbow) threw a bullpen session at Petco Park on Wednesday, AJ Cassavell of MLB.com reports.
The Padres recalled Morgan from Triple-A El Paso on Wednesday.
The Padres placed Estrada on the 15-day injured list Wednesday with a right shoulder impingement.
Triolo is out of the lineup for Wednesday's game against the Padres.
Campusano is not in the lineup for Wednesday's game versus the Pirates.
Fermin will start at catcher and will bat ninth in Wednesday's game against the Pirates.
Pivetta (forearm) struck out four and allowed three earned runs on four hits and one walk in three innings Tuesday in a rehab start with Single-A Lake Elsinore.
Montgomery walked one and struck out two in a scoreless and hitless inning to earn the save in Tuesday's 1-0 win over the Padres.
Cruz went 1-for-3 with a solo home run and a walk in Tuesday's 1-0 win over the Padres.
Perhaps a sense of urgency for the Padres today as they look to avoid an embarrassing home sweep -- just can't do that when chasing a wild-card spot. Even losing the first two, the Dads are 15-4 in their past 19 at home. Pittsburgh hasn't swept a road series in about 13 months (July 28-30 at SF last season). Both bullpens are wrecked after last night's 12-inning game. Bucs rookie Bubba Chandler is 2-5 with a 4.54 ERA away. San Diego's Randy Vasquez has 2.91 ERA over his past eight appearances.
