Bass (illness) pitched a scoreless inning with one strikeout in a rehab appearance with Triple-A Iowa on Tuesday.
Bass looked sharp, as he worked through his inning of work in just 11 pitches, with eight going for strikes. The 30-year-old was pitching well for the Cubs this season, posting a 0.63 ERA and 1.12 WHIP across 14.1 innings, and he'll likely return at some point to provide bullpen depth.