The Astros have designated Tommy Manzella for assignment, according to MLB.com's Brian McTaggart (on Twitter). The moves creates roster space for Henry Sosa, who was called up to make his MLB debut against the Diamondbacks tonight.
This year Manzella has a .230/.319/.360 line in 417 plate appearances at Triple-A. Manzella had a .225/.267/.264 line in 282 plate appearances with Houston last year, sharing shortstop duties with Angel Sanchez.
Sosa, 26, has turned in four strong starts for Astros affiliates since joining the Houston organization in the Jeff Keppinger trade. He has a 4.53 ERA with 7.8 K/9 and 3.2 BB/9 in 89 1/3 minor league innings for the Giants and Astros this year.