This article was originally published on www.si.com/mlb/cubs as Cubs Front Office Executive Shares Thoughts On Michael Soroka Trade And Injury.

The Chicago Cubs are already down their trade deadline rotation upgrade. Right-hander Michael Soroka, who came over from the Washington Nationals in a three-player trade last week, exited Monday's game (CIN 3,

The Chicago Cubs say they knew the risk when they traded for pitcher Mike Soroka -- who saw his velocity drop over his final few starts for the Washington Nationals before the deal. On Monday, Soroka left his first start for the Cubs because of  shoulder discomfort,