Pierce Johnson made his major league debut on May 19th against the Brewers. He gave up two unearned runs in one inning of work. The next day it was back to Iowa.
Zac Rosscup spent parts of the 2013-2015 seasons with the Cubs. Shoulder troubles kept him off the mound all of the 2016 season. The Cubs signed him to a minor league deal over the winter and called him up on May 22. He pitched 2/3rds of an inning against the Giants and the got optioned back to AAA the next day.
The clubhouse tally now stands at 34 players.