Durzi, 27, arrives following a trade with the Utah Mammoth that sent center Vincent Trocheck to the Western Conference. Pettersson, 30, was acquired from the Vancouver Canucks; he played under Sullivan for five full seasons and parts of two others with the Pittsburgh Penguins.
Durzi should get a look on the second power-play unit with Fox quarterbacking the first. Pettersson is likely going to be a key part of the penalty kill.
"We talked about trying to improve our team speed, and it starts with our ability to move the puck," Sullivan said, "and I think those guys on the blue line are going to help us in that regard."
New York targeted a top-line scorer to replace Artemi Panarin, who was traded to the Los Angeles Kings on Feb. 4. Enter Pavel Dorofeyev, who in the past two seasons with the Vegas Golden Knights scored 72 goals, tied for 15th in the League, and played all 164 games.
Dorofeyev, who was acquired in a trade with Vegas, scored 37 goals in the regular season and 12 in the playoffs last season. He is expected to play on a line with one of the Rangers’ top two centers, either Mika Zibanejad or J.T. Miller.
"He's a scorer and he needs somebody to get him the puck, and one of the things when we watched him in Vegas, he was playing with a guy like Jack Eichel, who is pretty good at getting guys the puck," Sullivan said. "Whoever that center is that's going to play with him, and it's more than likely going to be either Mika or J.T., their ability to get him the puck is going to be important to set him up for success. We feel like both of those guys have the ability to get him the puck."