Pratto was called up from Triple-A Omaha on Tuesday.
Pratto will get his first taste of MLB action this season after slashing .230/.315/.378 with seven homers in 54 games at Omaha. With Adam Frazier headed to the bereavement list and Hunter Renfroe (toe) pushed to the IL, Pratto should serve primarily as a reserve first baseman but could see some action in the outfield.