Guerra (elbow) will be placed on the disabled list, but it's unclear how long he'll be sidelined, Tom Haudricourt of the Milwaukee Journal Sentinel reports.

Thus far, there has been no indication from the team if Guerra has been sent for any tests on his arm. He'll miss at least two starts, however, after getting roughed up by San Diego in his last outing Wednesday. Wily Peralta will take Guerra's place in the rotation beginning Tuesday against Atlanta.