The club optioned pitchers Miguel Castro and Scott Copeland to Buffalo to make room on the roster.
Delabar, 31, has appeared in nine games this season for the Bisons, posting a 2-0 record with an earned-run average of 1.00. Delabar owns a career record of 13-9 with one save and a 3.72 ERA in 152 games MLB games.
Jenkins, 27, has a 1-1 record in four starts for Buffalo with a 2.89 ERA. Jenkins has a 3-4 career record with a 3.25 ERA in 44 career appearances with Toronto.