Irvin was removed from Saturday's game against Atlanta with an apparent injury, Mark Zuckerman of NatsJournal.com reports.
Irvin took the mound to warm up for the sixth inning but was visited by one of the Nationals' trainers and subsequently removed from the game before the inning started. It's unclear what led to his removal, but the Nationals may provide more details in the near future. Irvin finished the day having allowed just one man to reach base via a walk while striking out seven batters over five shutout innings.