CINCINNATI (AP) -- Reds first baseman Joey Votto will have surgery to repair torn cartilage in his left knee, sidelining him for three to four weeks.

The 2010 National League MVP hurt the knee in late June but kept playing. He had a medical exam Monday evening that detected the injury.

Votto was out of the starting lineup against Arizona on Monday night, getting a day of rest and a chance to have the knee checked. He went hitless in his first two games back from another All-Star appearance, then had a single and a double during a 4-2 win over St. Louis on Sunday night that pushed the Reds into sole possession of first place in the NL Central.

Votto leads the NL in doubles, walks and extra-base hits, batting .342.