Welington Castillo activated from 15-day DL
Castillo missed 18 games with inflammation in his left rib cage. He had a two-game rehab stint with Triple-A Iowa.
On the season, Castillo is hitting .242 with five home runs and 21 RBIs for the Cubs.
Cubs manager Rick Renteria did not have Castillo in the starting lineup on Sunday against the Pirates.
To make room for Castillo, the Cubs designated catcher Eli Whiteside for assignment. In eight games, Whiteside was 3 for 25 with two RBIs.