Tiedemann (biceps) is expected to throw a bullpen session in the coming days, Mitch Bannon of SI.com reports.
It will be his first mound workout since he exited a start at Double-A New Hampshire back on May 4 due to left biceps inflammation. The talented young southpaw also battled shoulder trouble in the spring, but he seems to be headed in a positive direction now and could perhaps return to minor-league action sometime in late July.