Navarro isn't expected to require a stint on the disabled list, and he's already scheduled to take Saturday off because it's knuckleballer R.A. Dickey's turn in the rotation.
"We think it will just be a couple of days," Blue Jays manager John Gibbons said. "He won't play tomorrow anyways because of Dickey. But we had to cover ourselves with another catcher. He's feeling better today."
The 33-year-old Kratz was hitting .273 with a home run and five RBIs in 12 games for the Bisons this season. This is Kratz's second stint with the Blue Jays this season as he entered play Friday night with two hits -- including a home run -- in 10 at-bats this year.
Jenkins became the odd-man out in the bullpen as the Blue Jays continue to put a strong emphasis on keeping their relievers without options on the roster. Jenkins made just one appearance this season and allowed three runs over 1 1/2 innings after being promoted from Triple-A Buffalo early last week.