The Astros have been one of the busiest teams this season, and continue to trade away major league players, for minor-league prospects.
Johnson is hitting 279/.329/.428 with eight home runs this season.
Krauss batting line is 283/.416/.509 with 15 homers for Double-A Mobile
Borchering is batting .247/.310/.469 with 20 homers and 68 RBI between High- and Double-A.
The Astros completed trades recently that sent left-hander Wandy Rodriguez to the Pirates, outfielder Carlos Lee to the Marlins, Brett Myers to the White Sox and a 10 player trade with the Blue Jays,RHP Brandon Lyon, LHP J.A. Happ and RHP David Carpenter going to Toronto for Francisco Cordero, OF Ben Francisco, RHP Joe Musgrove, RHP Asher Wojciechowski, LHP David Rollins, C Carlos Perez