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Raposo, 26, will make his major league debut when he appears in a game for the Cardinals. He is batting .187 with five homers and 22 RBIs in 47 games this season with Memphis.
Also on Saturday, the Cardinals transferred right-hander Keynan Middleton from the 15-day to 60-day injured list. Middleton, 30, underwent surgery to repair his flexor tendon earlier this month and is expected to miss the remainder of the season.
Information from The Associated Press and Field Level Media was used in this report.
