Lilja, 37, had six assists and was a plus-9 last season, his first in Philadelphia. He joins a list of problems on the blue line for the Flyers, who lost out on signing defenseman Shea Weber, when their contract offer for the All-Star was matched by Nashville.
Philadelphia defenseman Andrej Meszaros is out with an Achilles problem, and captain Chris Pronger's future is uncertain after playing just 13 games last season. What's more, defenseman Matt Carle left the Flyers to sign with Tampa Bay in free agency.
The Flyers allowed 232 goals last season, and have been eliminated in the second round the past two seasons.