They also will be without another of their top forwards and may be without their captain.
Islanders star center Alexei Yashin has missed the past five games with a lacerated forearm that will keep him out until at least March. Captain Michael Peca missed the final two periods of Wednesday's 6-1 rout of Pittsburgh with a groin strain, and was unable to play Thursday as New York's six-game win streak was snapped with a 1-0 loss at Ottawa.
Right wing Mark Parrish, tied for second on the Islanders with 13 goals, played only 96 seconds Thursday before spraining his left ankle. He is expected to miss up to eight weeks.
Despite missing three of their best players, the Islanders played the Senators to a scoreless tie before Peter Schaefer scored the game's only goal with 5:55 left in regulation.
"We still played hard, which is good," Islanders defenseman Adrian Aucoin said. "That's the kind of game, if you're going to lose, you want to go down fighting, but it's a disappointing loss."
New York failed to get a point for just the third time in 14 games (10-3-0-1).
Garth Snow played another strong game in net for New York, stopping 22 of 23 shots. He has allowed one goal in each of his last three starts.
While the Islanders have been moving up the Eastern Conference standings lately, the Bruins have been sliding down.
Boston ended a nine-game home winless streak Thursday with a 3-2 victory over Toronto.
Rookie Shaone Morrison scored his first NHL goal and added an assist for the Bruins, winners of just three of 15 games (3-7-5) in December.
"It was important to get back in the win column," Bruins coach Mike Sullivan said. "We want to be a team that establishes pride in our home building and this was a big test for us."
"I played with Bergie one game and Sergei another game but I'd never played with them both together," said Thornton, who has gone nine games without a goal. "They're both exciting players. It's going to bring a new dimension to my game."
The Bruins are just 5-6-6-1 at home and have been shut out five times this season at the FleetCenter.