The Cardinals recalled Prieto from Triple-A Memphis on Monday.
St. Louis optioned infielder/outfielder Thomas Saggese to Triple-A in a corresponding move. Prieto has gotten off to a great start at Memphis this season, slashing .311/.357/.566 with six home runs over 28 contests. Slated to turn 27 on Sunday, Prieto can handle second base, third base and shortstop and will likely operate mainly as a reserve infielder.