The Giants transferred McDonald (elbow) to the 60-day injured list Thursday, Alex Pavlovic of NBC Sports Bay Area reports.
The Giants claimed Whitcomb off waivers from the Astros on Thursday and optioned him to Triple-A Sacramento, Alex Pavlovic of NBC Sports Bay Area reports.
The Rockies outrighted Julien to Triple-A Albuquerque on Thursday.
Sanmartin struck out two across one scoreless inning in Wednesday's 2-1 loss to the Astros.
Houser didn't factor into the decision Wednesday against the Astros, allowing two hits and a walk across six scoreless innings. He struck out five.
The Rockies reinstated Criswell (shoulder) from the 15-day injured list Wednesday and optioned him to Triple-A Albuquerque.
Romano earned the save in Wednesday's 6-4 win over the Diamondbacks, issuing one walk in a scoreless ninth inning.
Feltner (5-6) earned the win Wednesday over the Diamondbacks, allowing two runs on seven hits and three walks over five innings. He struck out two.
Giants manager Tony Vitello said after Wednesday's 2-1 loss to the Astros that the back issues Adames has been working through are unlikely to require a stint on the injured list, Alex Pavlovic of NBC Sports Bay Area reports.
Adames was removed in the eighth inning of Wednesday's game against the Astros due to a back injury, Justice delos Santos of The San Jose Mercury News reports.
