"I think everything that happened in the bubble has been addressed, dealt with," Cassidy said Wednesday. "We're moving on, getting ready to win next year. That includes our goaltender."
Rask left Toronto, the hub city for the Eastern Conference in the Stanley Cup Qualifiers and the first two rounds of the playoffs, on Aug. 15 and later told the Boston Herald he made the decision because of a medical emergency with his daughter.
The Bruins used goalie Jaroslav Halak and defeated the Carolina Hurricanes in five games in the best-of-7 Eastern Conference First Round before losing to the Tampa Bay Lightning in five games in the second round.
"I think Tuukka, he can speak for himself," Cassidy said. "But I think he just wants to get back in the net and play hockey and play well and give us a chance to win. Probably nobody more excited on our team to [be] getting back in there. I would assume that Tuukka would sort of say, 'Hey, I'm still the goalie I was last year and I'm ready to go. Family's good, I'm good. Everyone's in a good place. Let's play hockey.'"
Rask, who was voted a finalist for the Vezina Trophy as the best goalie in the NHL last season, led the League with a 2.12 goals-against average and was 26-8-6 with a .929 save percentage in 41 games. He was 1-3-0 with a 2.57 GAA and .904 save percentage in the postseason.
Cassidy also said forwards Brad Marchand and David Pastrnak remain on schedule after each had offseason surgery.
Marchand had sports hernia surgery Sept. 14 and was scheduled to make a full recovery in about four months, a time frame that would put him on target to return in mid-January. Pastrnak had a right hip arthroscopy and labral repair Sept. 16. His recovery was expected to take about five months, putting him in line for mid-February.
The NHL is targeting Jan. 1 to start the 2020-21 season.