The three have combined to total one goal and six assists during the past 10 games, and DeBoer said his offensively-challenged club needs more from them if the Devils hope to compete.
"The chances are there. They haven't finished the way we need them to," DeBoer said. "There's no doubt we need those guys to get us a goal a night."
Jagr, whose 694 career goals are tied for seventh in NHL history, said the line is lacking one element.
"We just don't have a goal scorer on our line," Jagr said. "I'm not a goal scorer. I say it all the time. I'm not. At least the way I look at myself, I'm a playmaker. I don't shoot first. I like to create chances. I'm better at that than scoring goals."
The Devils have scored more than two goals once in their past 10 games, a 5-3 loss to the Chicago Blackhawks on Jan. 3, and it's been the second unit of Ryane Clowe, Adam Henrique and Michael Ryder that has carried the load offensively, scoring 12 of New Jersey's 18 non-shootout goals in that span.
"That line has really helped us survive the injuries to [Damien] Brunner and [Patrik] Elias," DeBoer said.
Therrien said he will make no changes from the lineup that defeated the Chicago Blackhawks 2-1 in overtime Saturday, meaning defenseman Francis Bouillon will be a healthy scratch for a second straight game.
Carey Price will start in goal for the Canadiens while Martin Brodeur will start for the Devils after watching Cory Schneider start the three previous games. In 30 career starts at Bell Centre, Brodeur is 19-9-1 with a 1.66 goals-against average and .939 save percentage.
"It wasn't even a question whether or not he was going to start [Tuesday]," DeBoer said of Brodeur. "Regardless of what happened in Toronto [Sunday], that was an automatic that we were going to start him here [Tuesday].
"Marty wants to play. He's not doing somersaults because I told him he's playing for the first time in four games. I think he's excited and hopefully we get a great game out of him. I'm sure we will."
Here are the probable lineups for the Canadiens and Devils:
Scratched: Francis Bouillon