UNIONDALE, N.Y. - Calgary Flames captain Mark Giordano has been sidelined indefinitely with an undisclosed upper-body injury.

The NHL's top-scoring defenceman left Wednesday's 3-1 win over the New Jersey Devils in the third period after he was hauled down by Devils forward Steve Bernier.

"We want to make sure we're being diligent in terms of the protocol on all of the medical side of things," general manager Brad Treliving told reporters Friday on Long Island, where the Flames were to play the Islanders at night.

"Once we know where Mark's at, definitively, we'll share that ... there's still some things (we) have to go through here."

Giordano has 11 goals and 37 assists in 61 games and is plus-13.

The Flames are trying to stay in the playoff mix as they continue a seven-game road trip. Calgary ranked ninth in the Western Conference, but tied in points with eighth-place Los Angeles, prior to Friday's game.