What happened: The NHL off-season has put the defenseman trade market squarely in focus, with multiple blue-liners viewed around the league as candidates to be moved. Front offices are weighing deals to reshape their back ends as the summer market opens.

Why it matters: Defensemen are among the hardest assets to acquire in trade, so any movement on the blue line can reshape a contender's depth chart and a rebuilding club's asset base. With the new league year underway, teams short on right-shot or top-four defense have an early window to act before prices climb.

What to watch: Watch for which clubs convert interest into completed deals as the off-season market develops and whether early blue-line moves set the price for the next round of trades.