Seguin finished second behind Jamie Benn on the Stars with 73 points (33 goals) in 72 games during the regular season, but missed Dallas' final 10 regular-season games and first playoff game after sustaining a partially cut Achilles tendon March 17 against the Tampa Bay Lightning.
Seguin, 24, returned for Game 2 of the Western Conference First Round against the Minnesota Wild but "severely injured his calf muscle" in the game, Stars general manager Jim Nill said during their cleanup day May 13.
Seguin had started practicing but was unable to return for the Stars' Western Conference Second Round series against the St. Louis Blues. Dallas lost to St. Louis in seven games.
Seguin ramping up his training is a good sign for Team Canada, with the 2016 World Cup of Hockey approaching. Seguin was named to the team in the initial 16-player roster announcement March 2.
The eight-team World Cup of Hockey will be played Sept. 17 to Oct. 1 at Air Canada Centre in Toronto. All games will be televised by ESPN in the United States and Sportsnet and TVA Sports in Canada.
