The Nationals transferred Irvin (shoulder) to the 60-day injured list July 10.
Coming back from a right shoulder strain, Irvin began a rehab assignment Monday with three scoreless innings in the rookie-level Florida Complex League. Irvin will need additional rehab appearances, likely at a higher affiliate, before the Nationals consider re-inserting him into their rotation. Having been sidelined since May 23, the shift to the 60-day IL doesn't impact the right-hander's return timeline.