The Cubs acquired Codi Heuer from the White Sox, along with Nick Madrigal, in the Craig Kimbrel trade at the deadline last July.
Heuer pitched reasonably well for the Cubs after the deal, posting a 3.14 ERA and 1.151 WHIP in 25 appearances, with two saves.
Obviously, no MLB players on 40-man rosters are currently in action, but from this photo it appears Heuer will be out of action for quite some time:
Codi Heuer has had surgery on his arm and it looks pretty major. Thankfully surgery was a success pic.