Heuer and Nick Madrigal (hamstring) were sent from the White Sox to the Cubs in exchange for Craig Kimbrel on Friday, Bob Nightengale of USA Today reports.
Heuer is clearly the lesser part of the return for the Cubs but should still play a role for his new team. The 25-year-old righty has seen his ERA jump from 1.52 last year to 5.12 this season, though a similar jump in his BABIP from .193 to .360 accounts for much of that difference. He hasn't been a particularly exciting weapon this season, striking out a roughly average 23.5 percent of opposing batters, but it won't take much to earn high-leverage opportunities down the stretch for a Cubs team that's in the process of trading away most of its veterans.