"I was in bed," said Castro, drawing laughs from the media.
Castro was in bed in Louisville, where Triple-A Charlotte was playing. He is now replacing Brian Omogrosso as the White Sox long reliever. Omogrosso threw 2 1/3 innings during the Game 1 loss to Cleveland on Friday before being optioned to Charlotte.
Only eight of Castro's 142 career Minor League appearances have come in relief. But he's ready for whatever role the White Sox have in mind.
"The goal was to get here, and I'm right here," said Castro, who made four of his 16 appearances in relief for Charlotte this season. "So that's what matters to me, right now. I just want to do the best I can here ... and help this club."
Scott Merkin is a reporter for MLB.com. Read his blog, Merk's Works, and follow him on Twitter @scottmerkin. This story was not subject to the approval of Major League Baseball or its clubs.