Estevez (shoulder) threw a bullpen Sunday and is scheduled to throw another Wednesday, MLB.com reports.
Estevez has been on the injured list since April 1, originally due to a left foot contusion before suffering a right rotator cuff strain during a rehab assignment May 6. The veteran has steadily progressed in his recovery, and the move to bullpen sessions represents a positive step forward. If the right-hander comes out of Wednesday's session without any issues, he could quickly progress to facing live hitters.