Fiala had seven points (three goals, four assists) and was minus-12 in 19 games with the Wild. Rask had three points (two goals, one assist) in 23 games, and Donato had 16 points (four goals, 12 assists) in 22 games.
The Wild signed Donato to a two-year contract on July 16. Fiala is a restricted free agent, and Rask has four more years on his six-year contract.
Fenton was hired May 21, 2018, to replace Chuck Fletcher, who was fired April 23. Fenton received a multiyear contract as the third GM in the history of the Wild, who are entering their 19th NHL season.
The 59-year-old spent the previous 20 seasons with the Predators, including the final 12 as assistant GM to David Poile, helping them qualify for the playoffs in 11 of 14 seasons and reach the Cup Final in 2017. He was part of the management that drafted defensemen Roman Josi, Ryan Suter (who now plays for the Wild) and Shea Weber, and goalie Pekka Rinne.
"He was an assistant general manager really doing scouting. That was his role," Leipold said of Fenton. "And he was tremendous at that. It was the other portion of being a general manager, the organizational part, the strategic part, the management of people, the hiring and motivating of the departments. When I talk about not being a good fit, that's what I'm referring to."
Leipold acknowledged that Fenton's firing comes at an interesting time, with training camp opening Sept. 12 and less than a month after forward Mats Zuccarello signed a five-year contract July 1.
"Our organization and our culture were a little different than the way [Fenton] wanted to handle things," Leipold said. "We just felt this was the time to do it and we were going to move forward in a different direction."