Legwand, who has played his entire 15-season NHL career with the Predators, is scheduled to become an unrestricted free agent at the end of the season. He waived his no-trade clause to join the Red Wings.
Legwand, the second pick of the 1998 NHL Draft, was tied for the Predators scoring lead with 40 points (10 goals). He has 210 goals and 566 points in 956 NHL games.
Eaves, in the final year of the three-year contract, had two goals and five points in 25 games this season. He has been a healthy scratch for Detroit coach Mike Babcock the past five games.
The 29-year-old right wing has 74 goals and 146 points in 439 NHL games spanning nine seasons. He spent the past five seasons with Detroit. He played parts of two seasons for the Carolina Hurricanes and parts of three seasons for the Ottawa Senators.