Philadelphia Flyers defencemen Braydon Coburn and Andrew MacDonald will both miss approximately four weeks with lower body injuries.

Coburn has not played since the Flyers' opening night loss to the Boston Bruins. He attempted to return to the line-up for the Flyers' game against the Chicago Blackhawks on Tuesday but left the ice after pre-game warm-ups and did not dress for the game.

The 29-year-old did not register any points in his lone 2014-15 contest, but scored five goals and added 12 assists in a full 82 games last season, averaging a team-high 22:26 time on ice.

MacDonald was in the line-up for the Flyers' 5-3 Wednesday night win over the Pittsburgh Penguins.

He has appeared in seven games for the Flyers so far in 2014-15, scoring one goal and adding two assists. Only Mark Streit has logged more ice-time so far in 2014-15 than the 28-year-old MacDonald, who has averaged 22:55 per game.

The injuries further deplete a Flyers' blue line that was already without Kimmo Timonen. The veteran Finn is out until at least the start of 2015 with blood clots.

Timonen, 39, posted 35 points in 77 games with the Flyers in 2013-14, leading Philadelphia's defenders in power play ice-time.