Mat Gamel's bid to replace Corey Hart as the Milwaukee Brewers' first baseman for the early portion of the season is over before it began.

An MRI confirmed that Gamel tore the surgically repaired ACL in his right knee, sidelining him for the year, the Brewers announced Monday.

"He was pretty good when I talked to him earlier today, but it has to crush you," manager Ron Roenicke said. "You go through a long rehab period, which isn't fun. It's lonely, it's hard work, boring at times, and now to think you have to go through it all again, it's pretty rough."

The first sign of trouble for Gamel came Saturday when he was forced to leave the Brewers' first full-squad workout before it was finished. He was transported on a cart from the field to the training room to have the knee examined.

The original belief was that Gamel merely aggravated the knee and that he would be slowly worked back into action starting Monday.

"Really surprised me, because there was really no major event that happened that you would have thought would be that serious," Roenicke said. "I figured OK, he tweaked it, a couple of days and he's back on the field."