PITTSBURGH -- The Penguins’ already battered blue line has suffered another blow.

Trevor Daley will miss Game 6 with a lower body injury, Penguins coach Mike Sullivan said Monday morning.

Daley did not participate in the morning skate at PPG Paints Arena. Sullivan said the veteran puck-moving defenseman is day-to-day.

Daley only played 11:09 in the Caps’ 4-2 victory on Saturday night in Washington. He was run over by Caps bruiser Tom Wilson early in the game, then left the contest early in the third period.

The top candidates to replace Daley are Chad Ruhwedel and Mark Streit. Neither has suited up for a game this spring.

The loss is potentially a significant one for the Penguins’ back end, which is now without two key puck movers. Pittsburgh entered the playoffs without No. 1 defenseman Kris Letang, who underwent season-ending neck surgery last month.

Daley has one point in 10 postseason games for the Penguins. He averages 18:27 per contest.

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