Whisenhunt has made two rehab starts for Single-A San Jose since landing on Triple-A Sacramento's 7-day injured list July 22 with a sore foot, MLB.com reports.
Whisenhunt covered two scoreless innings last Tuesday and three scoreless innings Sunday, striking out six batters while allowing one hit and three walks between the two outings. The Giants haven't revealed the next step for Whisenhunt, but he could be ready to rejoin the Sacramento rotation later this week. The left-hander owns a 5.84 ERA, 1.66 WHIP and 102:43 K:BB in 77 innings at the Triple-A level this season.