The Rangers have designated left-hander Miguel De Los Santos for assignment, reports MLB.com's T.R. Sullivan. The move clears room on the 40-man roster as the team prepares to expand their big league roster today.
De Los Santos, 24, has pitched to a 5.22 ERA with 10.7 K/9 and 5.2 BB/9 in 58 2/3 innings for the club's Double-A affiliate this season. Baseball America ranked the southpaw as the Rangers' 29th best prospect before the season in their Prospect Handbook, saying he "projects as a late-inning reliever because of command issues and funky mechanics."