Rutherford targeting blue line help during next week

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If Trevor Daley doesn't return, the Penguins could go shopping for a defenseman. - MATT SUNDAY / DKPS

LAS VEGAS -- The Penguins could lose Nick Bonino to free agency but are still very well set at forward entering next season, especially with the likely addition of Daniel Sprong.

However, the defensive group is another story. And Jim Rutherford knows it.

There is considerable uncertainly on the defensive unit as the NHL off-season is about to kick into high gear.