Cizikas, 25, could have become a restricted free agent July 1. The contract is worth $16.75 million, Newsday reported, and runs through the 2020-21 season.

"I'm thrilled to remain a New York Islander for the next five years," Cizikas said. "The organization has been first-class ever since I was drafted and we've come so far as a team during my time here. I'm excited to continue to be a part of this group as we build toward the ultimate goal, the Stanley Cup."

Cizikas had 29 points (eight goals, 21 assists) in 80 games during the regular season and three assists in 11 games in the Stanley Cup Playoffs. He centered the Islanders' fourth line, playing with Matt Martin and Cal Clutterbuck. Martin can become an unrestricted free agent on July 1.

"Casey has developed into a highly dependable two-way center and we're pleased to sign him through 2021," general manager Garth Snow said. "His energy and passion both on the ice and in the community make him an invaluable piece of our lineup."

Cizikas was selected by the Islanders in the fourth round (No. 92) of the 2009 NHL Draft. In 290 regular-season games, he has 82 points (29 goals, 53 assists); he has three goals and five assists in 24 playoff games.

Video: NYI@NYR: Cizikas rips one past Lundqvist