Kahnle is expected to opt out of his minor-league deal with the Red Sox on Monday if he isn't added to the major-league roster, Tim Healey of The Boston Globe reports.
After signing late in spring training with Boston, Kahnle stayed behind at the Red Sox's complex in Florida before reporting to Triple-A Worcester in the second week of April. He's been excellent thus far, posting a 1.40 ERA, 1.29 WHIP and 21:11 K:BB in 19.1 innings. If the Red Sox aren't able to find a spot on the 26-man roster for the 36-year-old righty, he shouldn't have much trouble securing a major-league deal in free agency.