Krug led Bruins defensemen with 49 points (nine goals, 40 assists) in 61 games this season, 28 (two goals, 26 assists) coming on the power play, and averaged 20:29 of ice time per game. He had six assists in 13 games and averaged 22:51 of ice time in the postseason, when the Bruins were defeated in five games by the Tampa Bay Lightning in the best-of-7 Eastern Conference Second Round after winning their first-round series against the Carolina Hurricanes in five games and going 0-3-0 in the round-robin portion of the Stanley Cup Qualifiers.
Krug has played 523 games over nine seasons with the Bruins, scoring 337 points (67 goals, 270 assists). He has scored 52 points (11 goals, 41 assists) in 75 playoff games, helping the Bruins reach the Stanley Cup Final in 2019 (lost in seven games to the St. Louis Blues) and 2013 (lost in six games to the Chicago Blackhawks).
Zdeno Chara also can become an unrestricted free agent, and Sweeney said talks are ongoing between the Bruins and their captain.
"I've met with Zdeno, had conversations, going to continue to have conversations," Sweeney said. "You have to be on the same page as we move forward. We've conveyed where we are with that. We're going to continue to have communications with he and (agent) Matt Keator."
Sweeney would not comment on whether those discussions have centered around Chara's role for next season.
"We've just had really broad-based discussions on everything," he said.
The 43-year-old defenseman, the oldest player in the NHL this season, scored 14 points (five goals, nine assists) and averaged 21:01 of ice time. His role has diminished in recent seasons, though he remains a force on the penalty kill. Sweeney called him "a very important part, leader, of our hockey club."
Though goalie Tuukka Rask is signed for the upcoming season, the last of his eight-year, $56 million contract signed July 10, 2013, there have been rumors of a possible trade. Sweeney declined to comment on whether Rask has no-trade or no-movement protection but said he's in the Bruins' plans for next season.
Rask finished second in voting for the Vezina Trophy as the top goalie in the NHL, going 26-8-6 with an NHL-best 2.12 goals-against average and a .929 save percentage (minimum 40 games).
"No. No. As a matter of fact, our staff has communicated with Tuukka," Sweeney said. "As I said before, [he] remains a big part of our roster planning going forward because I think, by my knowledge, he was second in the Vezina balloting and we should look very, very comfortable the way our goaltending's at."
Rask opted out of the playoffs Aug. 15 during the first round. Jaroslav Halak started the final eight games for the Bruins.