Matzek has progressed to throwing 35-pitch bullpen sessions, Patrick Saunders of the Denver Post reports.
The Rockies have decided to go "a bullpen at a time" with the left-hander as he returns from an absence caused by his performance anxiety. It's unclear when he'll return to game action, but the progression in pitch count during each bullpen session is a good sign that he'll be decently conditioned when he is able to return. Matzek will likely slot into the rotation with Triple-A Albuquerque when he comes of the disabled list.