The Tigers designated Granillo for assignment Friday.
By designating Granillo for assignment and placing Matt Vierling (groin) on the 10-day injured list, the Tigers opened up the necessary spots on the 26- and 40-man rosters for 21-year-old outfielder Max Clark, who will make his major-league debut Friday against the Athletics. Granillo was claimed off waivers by the Tigers on July 11 and allowed three runs on six hits and two walks while striking out two across 3.2 innings with Toledo.