Mantha will miss some time after taking a high-stick to the throat in Saturday's 5-4 overtime win over the Islanders, according to Amanda Stein of the Devils' official site.
Mantha will head back to New Jersey for evaluation. As a result, he will miss at least the rest of the team's road trip, which ends with a game against Winnipeg on Tuesday. Mantha has five goals, 10 points, 21 shots on net and 11 hits in 17 appearances this season.