White Sox right-hander Miguel Castro is out for the season, reports Jesse Rogers of ESPN. The righty suffered a knee injury yesterday when he slipped on the first base bag while covering on a ground-ball to the right side. It's unclear if he'll require surgery or if the injury will impact his availability for next year's Spring Training.

Castro's season comes to a close after six appearances. The Sox acquired the veteran reliever in a trade that sent international bonus pool space to the Astros two weeks ago. Chicago hoped that Castro would pitch well enough in middle relief to be flipped for a lottery ticket prospect at the deadline. The 30-year-old righty surrendered five runs on as many hits and walks with four strikeouts over six innings. He'd been much better for Houston's Triple-A club to begin the season. He carried a 2.29 ERA with 20 strikeouts and five saves over 19 2/3 minor league innings.

Chicago will place Castro on the 60-day injured list when they need to open a spot on the 40-man roster. This will very likely end his brief stint in the organization. Castro has well over six years of MLB service and will hit free agency at the start of the offseason. He'll almost certainly be limited to minor league offers.