Indians designated hitter Travis Hafner has undergone surgery on his right knee and could be sidelined six weeks.
The club says the 30-minute operation to clean up frayed cartilage was done Thursday at the Cleveland Clinic.
Hafner was placed on the 15-day disabled list Wednesday. The Indians, however, say he will need at least one month to recover.
Hafner is in the final year of a four-year, $57 million contract. He is batting .242 with six home runs and 23 RBI in 39 games. His loss weakens a lineup already missing catcher Carlos Santana, who is on the seven-day DL with a concussion.
The Indians have lost five and six and fallen into second place in the AL Central behind the Chicago White Sox.