Grichuk is out of the lineup for Sunday's game against the Pirates.
Grichuk drew starts in all three games of the Diamondbacks' series with the Nationals to close out July, though Washington brought southpaws to the hill for each of those contests. With the Pirates starting three right-handers (Luis Ortiz, Mitch Keller and Paul Skenes), Grichuk has been on the bench for each contest in Pittsburgh and still looks to be locked into a short-side platoon role.