Gavin Hollowell (shoulder) started a minor league rehab assignment at Triple-A Iowa on Saturday.

Hollowell missed the entire month of August due to inflammation in his shoulder, but he’s now making tangible strides toward a return to the Cubs’ bullpen. He should only need a couple of tune-ups in a minor league setting before he’s cleared to return. The 28-year-old righty had registered a 2.51 ERA, 1.33 WHIP and a 13/8 K/BB ratio over 14 1/3 innings before landing on the injured list.