Korecky has appeared in one game for the Blue Jays this season, working 1 1-3 scoreless innings against Kansas City on May 30. He's 3-1 with six saves and a 0.26 ERA in 25 games at Buffalo.
Pillar is batting .243 with no homers and two RBIs. He singled home the winning run in the ninth inning of Monday's 5-4 victory over Minnesota.
Pillar, who bats right, has been in center field along with Anthony Gose while Colby Rasmus recovers from a sore right hamstring. Manager John Gibbons says he didn't expect to use Pillar in the next several days while the Blue Jays continue a stretch of six straight games against right-handed starters.