A magnetic resonance scan showed a torn anterior cruciate ligament in the knee, the team said.
The shortstop was injured Saturday during Milwaukee's 5-2 loss to San Francisco when he slid into second base. He was carried of the field with the help of Brewers' Manager Ron Roenicke.
A 14-year veteran, Gonzalez has compiled a .259 average with four home runs, 15 RBI and eight runs scored through 24 games this season.
Notable deaths of 2014 [PHOTOS]