The switch-hitting Navarro is batting .276 with four RBIs in eight games. The move is retroactive to April 22.
Navarro suffered the injury trying to stretch a single into a double in the seventh inning of Tuesday's 13-6 win over Baltimore. He was thrown out by Delmon Young on the play and grabbed the back of his left leg as he arrived at second base before slowly leaving the field.
Thole hit .269 with three RBIs in seven games at Buffalo. A six-year veteran who previously played for the New York Mets, he's considered a specialist at catching former Cy Young award winner R.A. Dickey's knuckleball.