The Cincinnati Reds got their first piece of really bad injury news Monday. Joey Votto will undergo arthroscopic knee surgery Tuesday to repair torn meniscus in his left knee. He is expected to miss three to four weeks.

"It's very tough news," Reds manager Dusty Baker said. "Hopefully the other guys can pick it up in his absence. Joey's in great shape. He's heals very quickly. We've got to tighten our belts."

The procedure is the same one Reds minor-leaguer Chris Valaika returned from in three weeks.

"It's a very simple procedure," general manager Walt Jocketty said. "It takes 20 minutes. It's a very simple 'scope. We think it will be three, four weeks. Joey feels very comfortable with it. He wants it to do done right away so he can come back and be sharp for the last two months of the season."

A roster move will be made Tuesday. Jocketty wouldn't say who it would be.

"We haven't discussed that yet," he said.

Votto is hitting .342 with 14 home runs and 49 RBI. His on-base percentage is .465. No other Red is above .354.

"It's going to be difficult to replace Joey Votto," Jocketty said.