The Astros selected Arrighetti's contract from Triple-A Sugar Land on Wednesday, Matt Kawahara of the Houston Chronicle reports.
Arrighetti is set to make his major-league debut in a starting role Wednesday in Kansas City. The 24-year-old is one of the team's top pitching prospects and holds a 2.16 ERA and 10:7 K:BB over 8.1 innings this season with Sugar Land. A 29.2 percent strikeout rate in the minors points to Arrighetti's promise, but a 10.7 walk rate suggests he's not a finished product yet, and fantasy managers might be best served with a wait-and-see approach.