The Red Sox selected Tolle's contract from Triple-A Worcester on Friday, Chris Henrique of the Boston Sports Journal reports.
Tolle is set to make his major-league debut Friday at Fenway Park against the visiting Pirates. The left-hander earned his first look in the big leagues after collecting a 3.04 ERA, 0.99 WHIP and 133:23 K:BB over 91.2 innings covering three levels in the minors. Tolle should remain in the Boston rotation for the rest of the season if he pitches well.