Callahan, 22, made his NHL debut on March 25 against the Columbus Blue Jackets. He was second on the Grand Rapid Griffins of the American Hockey League with 26 goals and fourth with 44 points in 70 regular-season games.
Callahan was a sixth-round pick (No. 180) in the 2009 NHL Draft.
Nestrasil, 23, had 16 goals and 36 points in 70 games for the Griffins. He was a third-round pick (No. 75) in 2009.
I mean, hockey had to change the rules because of Marty, and that's impressive. I got two Stanley Cup rings because of the guy. Look at the banners of [Scott Niedermayer, Scott Stevens and Ken Daneyko] and Marty is right up there when you think about the New Jersey Devils; he was part of the core group and he'll go down as one of the greatest goalies ever.
— New Jersey Devils center Scott Gomez on former teammate Martin Brodeur, who will announce his retirement Thursday