Schreiber (shoulder) is expected to be activated from the 60-day injured list Sunday versus the Mets or next Tuesday against Atlanta, MLB.com reports.
Schreiber has made four rehab appearances with Triple-A Worcester and is expected to pitch in back-to-back games Wednesday and Thursday. That could be his final test before he rejoins the Red Sox bullpen. Schreiber has been sidelined since mid-May with a right shoulder strain.