Description: Predators center Mike Fisher suffered a ruptured Achilles tendon and will miss the next four-to-six months, according to predators.nhl.com.
Insight: While Fisher isn't great, he's the Predators top center and was expected to play with newly acquired winger James Neal. Either Matt Cullen or Colin Wilson will play with Neal while Fisher is out. Obviously, both are a big step down from Evgeni Malkin.
Description: David Legwand has signed a two-year, $6 million contract with the Senators.
Insight: Legwand played the first 956 games of his career with the Nashville Predators before going to his hometown Red Wings at the trade deadline last season. He finished with 51 points (14 goals) in 83 games.
Description: Paul Stastny has signed a four-year, $28 million contract with the St. Louis Blues.
Insight: The 28-year-old Stastny had 25 goals and 60 points in 71 games last season and has produced at least 53 points in a season six times, but the Avalanche didn't have to re-sign him with so many young and talented centers in the fold. Whether he centers the top line or skates on the second line, Stastny is going to be playing with some skilled teammates as the Blues have one of the deepest teams in the NHL.
Description: The Senators have traded Jason Spezza to the Stars along with Ludvig Karlsson for Alex Guptill, Nicholas Paul, Alex Chiasson and a 2015 second-round pick.
Insight: This is the second straight offseason the Stars have acquired a frontline center. Spezza is likely to center the team's second line with free-agent acquisition Ales Hemsky at right wing. He shouldn't lose any fantasy value from the move.