Manager Matt Quatraro said Monday that he expects Schreiber (knee) to begin his rehab assignment Wednesday, Anne Rogers of MLB.com reports.
Schreiber landed on the 15-day IL on July 29 due to a right knee patella tendon injury. He threw his second bullpen session Sunday, and the 30-year-old right-hander is ready to embark on a rehab assignment to prepare himself for a return to the big club. Across 43 major-league outings this season, Schreiber has registered one save and 20 holds with a 4.14 ERA and 1.41 WHIP across 37 innings.