The Tigers re-signed Flores to a minor-league contract Thursday that includes an invitation to spring training, Evan Petzold of the Detroit Free Press reports.
Flores (shoulder) was activated from the 7-day minor-league injured list Monday, Evan Woodbery of MLive.com reports.
The Tigers optioned Flores to Triple-A Toledo on Tuesday, Evan Petzold of the Detroit Free Press reports.
The Tigers selected Flores to their 40-man roster Tuesday.
Flores (hamstring) began a rehab assignment with High-A West Michigan on Tuesday, striking out one over two scoreless innings while giving up two hits and no walks.