Siegenthaler is expected to miss time with a concussion. Head coach Travis Green told reporters Wednesday, "He'll be out for an extended period of time," per Amanda Stein of the Devils' official site.
Siegenthaler should be considered out indefinitely at this point. With John Marino (upper body) also in doubt, the Devils could be forced to use Nick DeSimone and Santeri Hatakka as their third pairing against the Stars on Thursday.