Barzal has led the team in scoring, or been tied for the lead, every season since he became a full-time NHL player in 2017-18.
Ottawa acquired the veteran netminder from the Wild for goalie Filip Gustavsson in July.
Sandin had 16 points in 51 games with the Leafs last season.
Tavares underwent testing Tuesday while the team practised, leading to the diagnosis of his injury.
The 25-year-old forward injured himself at training camp in Whistler, B.C.
The 22-year-old Hayton recorded 10 goals and 14 assists in 60 games with the Coyotes this past season.
MacKinnon, who just turned 27 earlier this month, signed an eight-year contract worth $100.8 million.
The player the NHL knew as “Big Zee” is calling it a career.
The 33-year-old Toronto native played 13 seasons with the Montreal Canadiens, Nashville Predators and New Jersey Devils.
The native of St. Clair, Mich., was selected in the fourth round (121st overall) of the 2013 NHL draft by the Chicago Blackhawks.
Team physician Michael Terry said Tuesday that McCabe is expected to return in 10 to 12 weeks.
Kyrou set career highs with 27 goals, 48 assists and 75 points in 74 games last season.
Rodrigues arrives in the Mile High City after a season in Pittsburgh, where he set career highs with 19 goals and 24 assists.
Suzuki, 23, becomes the youngest captain in team history.
Star centre Tim Stutzle has agreed to an eight-year, US$66.8-million contract extension, the team announced.
Dach had 26 points (nine goals, 17 assists) in 70 games with the Chicago Blackhawks last season.
Brannstrom, 23, established new career highs in assists (14), points (14) penalty minutes (30) and games (53) last season.
The 29-year-old Miller was Vancouver’s leading scorer last season with 99 points on 32 goals and 67 assists in 80 games.
Murray appeared in 37 games for the Colorado Avalanche last season and recorded four assists.
Gagner, 33, had 13 goals and 18 assists in 81 games with Detroit last season.