Mat Gamel has torn the ACL in his right knee for the second time in less than a year and will miss the season.

He was injured May 1 at San Diego when he hit a wall while chasing a foul pop-up. Gamel reinjured the knee Saturday during Milwaukee's first full-squad workout this year.

"It really surprised me because there was no really major event that happened that you would have thought that would have been that serious," Ron Roenicke said. "I figured, OK, he tweaks it. Coming back after a rehab you figure it is not always going to go smooth. I figured a couple of days and he'd be back on the field."

An MRI Sunday revealed the extent of the injury.

"It's a tear of the middle portion of the repair," he said. "There are failures -- 10 percent seems to be the historical number. But of those failures, they're mostly at either end" of the ligament.