Diamondbacks manager Torey Lovullo said Monday that Thomas received a platelet-rich plasma injection for his left hamstring, Nick Piecoro of The Arizona Republic reports.
McCarthy is out of the lineup for Monday's game against the Reds.
Arizona Diamondbacks
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Rotowire: May 13, 3:03pm
Savino (shoulder) began a rehab assignment with the Diamondbacks' rookie-level Arizona Complex League affiliate May 4 and has struck out six over 4.1 scoreless innings while allowing one hit and three walks through his first three appearances.
Jarvis (0-2) was the losing pitcher in Saturday's 5-4 extra-innings loss to Baltimore. He allowed one run on one hit and two walks while striking out one over one-plus innings.
Nelson came away with a no-decision in Saturday's 5-4 extra-innings loss to the Orioles, giving up three runs on 10 hits over 4.2 innings. He struck out three without walking a batter.
Pfaadt (1-3) took the loss Friday as the Diamondbacks fell 4-2 to the Orioles, giving up three runs on five hits and two walks over six innings. He failed to strike out a batter.
Arizona manager Torey Lovullo said Friday that Thomas (hamstring) will seek a second and third opinion on his MRI results, Steve Gilbert of MLB.com reports.