The Flyers are expected to use an ultra-young defense this season, one that might include Shayne Gostisbehere, Ivan Provorov, Sam Morin and Robert Hagg.
Combined, they have three seasons of NHL experience.
That makes Radko Gudas and Andrew MacDonald the veterans on the back end.
That is, if MacDonald, who will be 31 when the season starts, remains with the team.
MacDonald was plagued by turnovers last season, but he was one of the team's steadier defensemen. He was second on the Flyers in blocked shots (151) and average time on ice (20 minutes, 6 seconds per game) and tied for second among everyday defensemen in plus-minus (minus-5).