Graterol will be recalled from Triple-A Oklahoma City on Friday, Fabian Ardaya of The Athletic reports.
Graterol was sent to the minors in early July, but he'll rejoin the big-league club ahead of Friday's series opener against the Rockies after Max Muncy was placed on the paternity list. The right-hander has posted a 6.75 ERA and 1.50 WHIP in four innings across five relief appearances this year.