The White Sox signed Mitchell to a minor-league contract Sunday that includes an invitation to spring training, Aram Leighton of Just Baseball reports.
The Padres reassigned Mitchell to minor-league camp Monday.
Mitchell signed a minor-league contract with the Padres on Wednesday and received an invitation to major-league spring training, Britt Ghiroli of The Athletic reports.
Pittsburgh outrighted Mitchell to Triple-A Indianapolis on Tuesday, Kevin Gorman of TribLive.com reports.
The Pirates designated Mitchell for assignment Friday.
Mitchell was optioned to Triple-A Indianapolis on Friday.
Pittsburgh recalled Mitchell from Triple-A Indianapolis on Tuesday.
Mitchell was optioned to Triple-A Indianapolis on Sunday, Rob Biertempfel of The Athletic reports.
Mitchell is out of the lineup for Wednesday's game against the Cardinals.
Mitchell is out of the lineup for Tuesday's game against the Cardinals.