Janssen, who re-signed with the Devils this offseason but rarely played during the postseason, issued his apology through the team Friday morning.
He participated in an Internet-based radio show earlier in the week and said he used poor judgment during the course of the show.
Janssen says he regrets his action and said he arranged the interview on "The Thom and Jeff Show," noting the Devils had no knowledge of it.
"I would like to apologize for my poor choice of language," Janssen said. "The tone of the interview was very casual and off-color, and I lost focus on what is and is not acceptable and professional. I am deeply sorry to anyone who was offended by my language."