Stewart joined the Red Sox as a non-roster invitee Tuesday.
Stewart cleared waivers and was outrighted to the Tigers' alternate training site Tuesday.
Stewart was optioned to Triple-A Toledo on Tuesday.
Stewart will be competing for a bench spot during spring training after the Tigers added to their outfield depth during the offseason, Chris McCosky of The Detroit News reports.
Stewarts was recalled by the Tigers on Friday.
Stewart is not in the lineup for Tuesday's game against the Cubs.
Stewart went 1-for-4 with a two-run home run in Monday's 9-3 loss to the Cubs.
Stewart is out of the lineup for Sunday's game against the Indians, Chris McCosky of The Detroit News reports.
Stewart is not starting Friday in Cleveland.
Stewart isn't starting Wednesday against the White Sox.