Lugo played one inning in the field against the Yankees on Friday before being removed from the lineup and sent for an MRI.

General manager Theo Epstein said Sunday that Lugo could have a tear of the meniscus cartilage. The length of time Lugo will be out will depend on what is found.

If there is an actual meniscus injury, Lugo could be out three to four weeks.

Boston RedSox News News » Red Sox SS Lugo to undergo knee scope
Red Sox SS Lugo to undergo knee scope
FORT MYERS, Fla. (AP) - Red Sox shortstop Julio Lugo is expected back in Boston this week for arthroscopic surgery on his right knee. MLB Spring Training