"If there's an inning where you've got left-right-left or if we can pick a spot that might be a little bit more advantageous to his left-handed pitching, that might be the case," said Farrell. "A clean inning would be the ideal thing, and as rested as our bullpen is right now, we can afford to do that. When that is over these three days remains to be seen."
Ryan Dempster is also gaining comfort in his transition to the bullpen and has pitched consecutive scoreless appearances over the last week.
Farrell would also like to get more looks at lefty Matt Thornton, whose time with the Red Sox has been disjointed thanks to an oblique injury that had him on the disabled list.
The position-player roster also has some competition. Outfielders Jackie Bradley Jr. and Quintin Berry could be battling with infielder John McDonald for the final spot on the bench. Berry might have the edge because of his base-stealing capability.
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. This story was not subject to the approval of Major League Baseball or its clubs.