Pittsburgh Penguins' Brandon Sutter, from left, Matt Cooke, Tyler Kennedy, Brooks Orpik and Paul Martin celebrate Kennedy's goal against the Ottawa Senators during the second period of Game 4 of their Stanley Cup Eastern Conference semifinal NHL hockey series at Scotiabank Place in Ottawa on Sunday, May 19, 2013. (AP Photo/The Canadian Press, Patrick Doyle)

Pittsburgh Penguins' Brandon Sutter, from left, Matt Cooke, Tyler Kennedy, Brooks Orpik and Paul Martin celebrate Kennedy's goal against the Ottawa Senators during the second period of Game 4 of their Stanley Cup Eastern Conference semifinal NHL hockey series at Scotiabank Place in Ottawa on Sunday, May 19, 2013. (AP Photo/The Canadian Press, Patrick Doyle)

Pittsburgh Penguins' Matt Cooke (24) collides with Ottawa Senators' Erik Karlsson (65) in the first period of Game 1 of an NHL hockey Stanley Cup second-round playoff series against the Ottawa Senators in Pittsburgh, Tuesday, May 14, 2013. (AP Photo/Gene J. Puskar)

New York Islanders defenseman Lubomir Visnovsky (11), of Slovakia, defends Pittsburgh Penguins center Evgeni Malkin (71,) of Russia, as Pittsburgh Penguins left wing Matt Cooke (24) gains control of the puck behind the Islanders net in the first period of Game 6 of a first-round NHL Stanley Cup playoff hockey series in Uniondale, N.Y., Saturday, May 11, 2013. (AP Photo/Kathy Willens)

New York Islanders defenseman Lubomir Visnovsky (11), of Slovakia, defends Pittsburgh Penguins center Evgeni Malkin (71,) of Russia, as Pittsburgh Penguins left wing Matt Cooke (24) gains control of the puck behind the Islanders net in the first period of Game 6 of a first-round NHL Stanley Cup playoff hockey series in Uniondale, N.Y., Saturday, May 11, 2013. (AP Photo/Kathy Willens)

Pittsburgh Penguins goalie Tomas Vokoun (92) celebrates with Matt Cooke (24) after shutting out the New York Islanders 4-0 in Game 5 of an NHL hockey Stanley Cup first-round playoff series, Thursday, May 9, 2013, in Pittsburgh. The Penguins lead the series 3-2. (AP Photo/Gene J. Puskar)

Pittsburgh Penguins goalie Tomas Vokoun (92) celebrates with Matt Cooke (24) after shutting out the New York Islanders 4-0 in Game 5 of an NHL hockey Stanley Cup first-round playoff series, Thursday, May 9, 2013, in Pittsburgh. The Penguins lead the series 3-2. (AP Photo/Gene J. Puskar)

Pittsburgh Penguins center Brandon Sutter (16) and left wing Matt Cooke (24) react after Sutter scored as New York Islanders goalie Evgeni Nabokov (20), of Russia, looks on from the ice after in the second period of Game 4 of their first-round NHL hockey Stanley Cup playoffs hockey series at Nassau Coliseum in Uniondale, N.Y., Tuesday, May 7, 2013. (AP Photo/Kathy Willens)

UNIONDALE, NY - MAY 07: Matt Cooke #24 of the Pittsburgh Penguins celebrates a goal as Evgeni Nabokov #20 and Matt Carkner #7 of the New York Islanders react in Game Four of the Eastern Conference Quarterfinals during the 2013 NHL Stanley Cup Playoffs at the Nassau Veterans Memorial Coliseum on May 7, 2013 in Uniondale, New York. The Islanders defeated the Penguins 6-4. (Photo by Bruce Bennett/Getty Images)

UNIONDALE, NY - MAY 07: Matt Cooke #24 of the Pittsburgh Penguins hits Matt Carkner #7 of the New York Islanders into the boards in Game Four of the Eastern Conference Quarterfinals during the 2013 NHL Stanley Cup Playoffs at the Nassau Veterans Memorial Coliseum on May 7, 2013 in Uniondale, New York. (Photo by Bruce Bennett/Getty Images)

UNIONDALE, NY - MAY 07: Travis Hamonic #3 of the New York Islanders moves the puck away from Matt Cooke #24 of the Pittsburgh Penguins in Game Four of the Eastern Conference Quarterfinals during the 2013 NHL Stanley Cup Playoffs at the Nassau Veterans Memorial Coliseum on May 7, 2013 in Uniondale, New York. (Photo by Bruce Bennett/Getty Images)

Pittsburgh Penguins' Matt Cooke, right, takes down New York Islanders' John Tavares during the third period of Game 3 of an NHL hockey Stanley Cup first-round playoff series on Sunday, May 5, 2013, in Uniondale, N.Y. (AP Photo/Seth Wenig)

Pittsburgh Penguins' Matt Cooke, right, takes down New York Islanders' John Tavares during the third period of Game 3 of an NHL hockey Stanley Cup first-round playoff series on Sunday, May 5, 2013, in Uniondale, N.Y. (AP Photo/Seth Wenig)

UNIONDALE, NY - MAY 05: Matt Cooke #24 of the Pittsburgh Penguins argues a call in the game against the Pittsburgh Penguins in Game Three of the Eastern Conference Quarterfinals during the 2013 NHL Stanley Cup Playoffs at the Nassau Veterans Memorial Coliseum on May 5, 2013 in Uniondale, New York. (Photo by Bruce Bennett/Getty Images)

Referee Chris Lee (28) gets pinned between Pittsburgh Penguins' Matt Cooke, rear, and New York Islanders' Brian Strait (37) during the second period of Game 2 of an NHL hockey Stanley Cup first-round playoff series, Friday, May 3, 2013, in Pittsburgh. (AP Photo/Gene J. Puskar)

Pittsburgh Penguins' Matt Cooke (24) shoots the puck past Carolina Hurricanes goalie Justin Peters (35) for a goal in the third period of an NHL hockey game in Pittsburgh Saturday, April 27, 2013. The Penguins won 8-3. (AP Photo/Gene J. Puskar)

A shot by Pittsburgh Penguins left wing Matt Cooke (24) gets through New Jersey Devils goalie Johan Hedberg (1), of Sweden, for a goal during the first period of an NHL hockey game, Thursday, April 25, 2013, in Newark, N.J. (AP Photo/Julio Cortez)

NEWARK, NJ - APRIL 25: Matt Cooke #24 of the Pittsburgh Penguins scores at 8:52 of the first period against Johan Hedberg #1 of the New Jersey Devils at the Prudential Center on April 25, 2013 in Newark, New Jersey. (Photo by Bruce Bennett/Getty Images)

Pittsburg Penguins' Matt Cooke (24) checks Ottawa Senators' Cory Conacher (89) during the third period of their NHL hockey game in Ottawa, Ontario, Monday, April 22, 2013. The Penguins won 3-1. (AP Photo/The Canadian Press, Fred Chartrand)

Pittsburg Penguins' Tyler Kennedy (48) celebrates with teammates Brandon Sutter (16) and Matt Cooke (24) as Ottawa Senators' Sergei Gonchar (55) and Colin Greeening (14) look on during the third period of their NHL hockey game in Ottawa, Ontario, Monday, April 22, 2013. The Penguins won 3-1. (AP Photo/The Canadian Press, Fred Chartrand)

NEW YORK, NY - APRIL 03: John Moore #17 of the New York Rangers hits Matt Cooke #24 of the Pittsburgh Penguins at Madison Square Garden on April 3, 2013 in New York City. The Rangers defeated the Penguins 6-1. (Photo by Bruce Bennett/Getty Images)

NEW YORK, NY - APRIL 03: John Moore #17 of the New York Rangers hits Matt Cooke #24 of the Pittsburgh Penguins at Madison Square Garden on April 3, 2013 in New York City. (Photo by Bruce Bennett/Getty Images)

UNIONDALE, NY - MARCH 22: Brandon Sutter #16 (far right) of the Pittsburgh Penguins scores the game winning goal at 1:46 of the third period against the New York Islanders and is joined by James Neal #18 (L) and Matt Cooke #24 (C) at Nassau Veterans Memorial Coliseum on March 22, 2013 in Uniondale, New York. The Penguins defeated the Islanders 4-2. (Photo by Bruce Bennett/Getty Images)

Pittsburgh Penguins left wing James Neal (18) celebrates his empty-net goal with Pittsburgh Penguins center Evgeni Malkin (71), Pittsburgh Penguins left wing Matt Cooke (24), Pittsburgh Penguins defenseman Brooks Orpik (44), and Pittsburgh Penguins defenseman Kris Letang (58) in the third period of an NHL hockey game in Pittsburgh, Monday, March 4, 2013. The Penguins won 4-3. (AP Photo/Gene J. Puskar)

Ottawa Senators defenseman Erik Karlsson (65) limps off the ice as a team trainer arrives to help him after Karlsson collided with Pittsburgh Penguins left wing Matt Cooke during the second period of an NHL hockey game in Pittsburgh on Wednesday, Feb. 13, 2013. Karlsson did not return to the game. The Penguins won 4-2. (AP Photo/Gene J. Puskar)

Ottawa Senators defenseman Erik Karlsson, center, grimaces as he hits the boards after colliding with Pittsburgh Penguins left wing Matt Cooke, left, during the second period of an NHL hockey game in Pittsburgh on Wednesday, Feb. 13, 2013. Karlsson was helped off the ice. (AP Photo/Gene J. Puskar)

Ottawa Senators defenseman Erik Karlsson (65) grimaces as he falls to the ice after colliding with Pittsburgh Penguins left wing Matt Cooke, left, during the second period of an NHL hockey game in Pittsburgh Wednesday, Feb. 13, 2013. Karlsson was helped off the ice. (AP Photo/Gene J. Puskar)