Giants manager Tony Vitello confirmed on KNBR 680 that Whisenhunt will be recalled from Triple-A Sacramento to start Thursday's game against the Rockies.
The left-hander is making a spot start as the Giants look to get their regular rotation members some extra rest. Whisenhunt allowed two runs and struck out two over five innings in his lone start for San Francisco earlier this season, and he holds a 4.42 ERA, 1.47 WHIP and 82:37 K:BB over 77.1 innings in 2026 at Sacramento.