The 29-year-old Modano suffered a concussion, a broken nose and strained neck ligaments on Oct. 2 against Anaheim.
Modano was injured when he was checked hard from behind and slammed into the boards by Mighty Ducks defenseman Ruslan Salei, who has been suspended for 10 games.
Sydor, 27, suffered a fractured left eye socket in the same game.
Chambers, 33, had arthroscopic surgery Monday on his right knee and was to undergo rehabilitation and be reevaluated in mid-January.
Skrudland, 36, suffered a bruised chest Friday against Anaheim. He'll be out for about four weeks.
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