Karlsson hasn't played since sustaining a 70-percent tear of the Achilles' tendon in his left leg when he was stepped on by the Pittsburgh Penguins' Matt Cooke during a game Feb. 13.
The 2012 Norris Trophy winner underwent surgery to repair the cut Feb. 14, and was expected to miss 3-4 months. He had 10 points in 14 games at the time of the injury, and was averaging 27:03 of ice time per game.
It's a fresh wound right now. I didn't really get a chance to say goodbye. I owe a lot to the fans. The same reason why they fell in love with me many years ago I think is the same reason why they probably understand what I'm all about. I think I'm a character guy. I know this is hard for them. I didn't take this decision lightly, but I knew it was the right one.
— Martin St. Louis after being traded from the Lightning to the Rangers on Wednesday