Drabek is not injured and has been placed on the temporary inactive list. He is not scheduled to pitch in either the Arizona Fall League or the Florida Instructional League.
The 21-year-old Drabek was 8-2 with a 3.64 ERA in 96 1/3 innings at Reading and 4-1 with a 2.48 ERA in 61 2/3 innings at Class A Clearwater earlier this season.
The move was made in large part to preserve Drabek's immediate future. A first-round pick in the 2006 First-Year Player Draft, Drabek has recovered well from Tommy John elbow ligament replacement surgery July 25, 2007.
Andy Jasner is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.