"It's going to be an extended period of time," Boughner said after practice Monday. "Whether that's three weeks, four weeks, five weeks, that's going to (depend on how) his rehab goes, that kind of thing. (He's) definitely out for a while."
Boughner added the injury isn't related to Luongo's surgically-repaired hip.
Luongo underwent an MRI after exiting Monday's game against the New York Islanders with the apparent injury. In 15 appearances this season, he has a 6-6-1 record and .928 save percentage.