Dunning made 15 starts last season with Class A Advanced Winston-Salem and Double-A Birmingham before developing a moderate elbow strain in late June. He did not pitch in a game again in 2018.
Dunning was healthy heading into Spring Training, but he experienced a setback and did not appear in a game. He had rested, then resumed his throwing program prior to Monday’s appointment with Dr. Andrews.
The Nationals took Dunning with the 29th overall pick in the 2016 MLB Draft. He was traded to Chicago in December 2016, along with Lucas Giolito and Reynaldo Lopez for Adam Eaton.