Valera, who has had an injury-plagued season, is active for Triple-A Columbus and hitting .136 with one extra-base hit, 10 walks and 13 strikeouts through 13 games.
He has been on the injured list twice, first opening the season on the IL with a wrist injury and then suffering a hamstring injury in mid-May. Valera was activated from his most recent stint on the IL on June 17 after rehabbing in the Arizona Complex League. He doesn't turn 23 until November, so Valera still has youth on his side, but he has a career .202/.316/.384 slash line with nine home runs in 55 games at Triple-A.