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Tuivailala (knee) departed for Triple-A Memphis on Tuesday and will officially begin his rehab assignment Wednesday, Joe Trezza of MLB.com reports.
According to general manager Michael Girsch, Tuivailala will need to be able to work multiple innings and pitch on back-to-back days before he's deemed ready to return to the big-league club. Girsch described him as "relatively close to being ready to go."
