Blackburn (wrist) was transferred to the 60-day DL on Tuesday.
Blackburn was expected to miss the remainder of the season after being hit by a comebacker late last month, and this move makes it official. The right-hander turned in a 3.22 ERA over 58.2 innings for Oakland this season, but the peripherals suggest he overachieved to a large extent (2.5 percent K-BB%). Regardless, Blackburn figures to get a chance to compete for a roster spot in spring training.