There is no doubt Andrew MacDonald and Travis Hamonic make up the New York Islanders' top defensive pairing. They play the most minutes each night and consistently go up against the opposition's top forwards. But they can't do it alone. That's why the Islanders, who were sloppy in a 5-2 loss on home ice to the Philadelphia Flyers on Saturday, need more from their other four defensemen -- on both ends of the ice -- if they're going to be a force in the Metropolitan Division. "Those guys are going to play top minutes, none different than [Ryan] McDonagh and [Dan] Girardi," Islanders coach Jack Capuano said of MacDonald and Hamonic, who will receive top minutes again Tuesday night against the New York Rangers at Nassau Veterans Memorial Coliseum. "We just collectively back there have to play better. Guys are giving us what they have, [but] we're making mistakes that they see, they know and I've got the confidence in them that it's going to get better. But for us to be successful, we have to have better decisions with the puck on our stick. Our gaps have got to be better, our sticks have got to be better, we've got to defend harder. We've gone through this. I have the confidence they're going to rebound." The biggest issue facing the Islanders' defense is the injury to Lubomir Visnovsky, who suffered a concussion in a game against the Carolina Hurricanes on Oct. 19. He hasn't played since and there is no timetable for his return. Visnovsky's injury only increases the workload for MacDonald and Hamonic, which is why Capuano needs more from the likes of Thomas Hickey and Matt Donovan. "If we're going to be the team we want to be, I think everyone's got to step up," said Hickey, who averages nearly 18 minutes per game. "Trav and A-Mac do a great job handling the top guys. As a group, the rest of us need to step up a bit and limit those 5-on-5 goals." Offensively, the Islanders' defensemen have provided little thus far this season. Donovan and Visnovsky have one goal apiece, both via the power play. The group has yet to score a goal at even strength, something they hope changes Tuesday night, when they face the New York Rangers at Nassau Veterans Memorial Coliseum.