Stevens has been suffering from post-concussion syndrome since the first week of January. He has not been back since, missing each of the next 40 games.
Renowned concussion specialist Dr. Karen Johnston recently re-examined Stevens, who turns 40 on Thursday. Tests determined that the rugged defenseman is not yet at 100 percent.
"And only when it is determined that he is at 100 percent will he participate with the team," Devils general manager Lou Lamoriello said Monday. "He will continue to work out both on and off the ice. There is no timetable for his return."
Stevens has been the heart and soul of a team that has won three Stanley Cups since 1995. The 14-time All-Star had not missed more than seven regular-season games since the 1991-92 season -- his first with New Jersey.