Though the addition of Ullmark should help, the Bruins lost some offense when center David Krejci decided July 30 not to play in the NHL this season and instead continue his hockey career in his native Czech Republic. The 35-year-old, who has scored 730 points (215 goals, 515 assists) in 15 seasons with the Bruins, is an unrestricted free agent.
"He's been just a thrill to play with and has made me such a better player," McAvoy said. "I've enjoyed every second sharing the ice with him. I'm very excited for him and his family. ... He's going back to Czech Republic and it sounds as though this is exactly what he wants to do, and he deserves to do exactly what he wants to do.
"He's had an unbelievable career, and I guess it's still open-ended. Maybe we'll see him again."
The absence of Krejci will create a void at second- or third-line center.
"I think we're all excited and ready to get to camp, excited with the new acquisitions and we obviously got our core group of Patrice Bergeron, Brad Marchand, McAvoy and Matt Grzelcyk back there," Clifton said. "I think we just need to come in ready to go and continue to build our game."
The Bruins signed forwards Nick Foligno, Erik Haula, and Tomas Nosek each to a two-year contract and defenseman Derek Forbort to a three-year contract July 28.
"It's a good opportunity with a really good team," Haula said while taking part in Da Beauty League on Aug. 9. "I take it as a chance to win and be in the mix and that's always exciting."
McAvoy became the leader of the Bruins defensemen last season after the departure of
Zdeno Chara
, who agreed to a one-year contract with the Washington Capitals on Dec. 30 after 14 seasons with Boston. McAvoy scored 30 points (five goals, 25 assists) and averaged 24:00 of ice time in 51 games, the most of his four NHL seasons, and averaged an NHL career-high 2:24 of ice time while shorthanded. He scored 12 points (one goal, 11 assists) in 11 playoff games and averaged a Bruins-high 26:39 of ice time.
"Everything we give him, he seems to excel at," Bruins coach Bruce Cassidy said in May. "Obviously he's still a young guy in this League that's only going to get better. Has a tremendous ceiling. Seems to get highly motivated for the bright lights.
"The thing that goes unnoticed with Charlie is he plays a lot of hard minutes and recovers well. He's got a real good ability to sort of reset and get back out there. I don't know if he's got extra-large lungs or what."
McAvoy said, "I've been in Boston this offseason, living there for the summer. I'm able to work out, skate there ... I have a great setup. I love where the team is at. I think we've made a lot of great additions this offseason and we're really excited about it. I'm excited to meet those [new] guys, to be able to play with them."
NHL.com independent correspondent Jessi Pierce contributed to this report