Boston finished second in the conference with 112 points, one behind the Tampa Bay Lightning, won a playoff series for the first time since 2014, and lost to the Lightning in five games in the second round.
"Obviously our team accomplished a lot to get to the 112-point level, so ideally you'd like to bring everybody back and think you'll take another run at it," Sweeney said. "I don't think that's realistic in a cap environment. We could afford the salaries they're currently at, and some of the guys had very good years and you'd expect that to change."
RELATED: [Nash would consider returning to Bruins]
Rick Nash, 33, had six points (three goals, three assists) in 11 regular-season games, and five points (three goals, two assists) in 12 playoff games. He was acquired in a trade with the New York Rangers on Feb. 25 and completed an eight-year, $62.4 million contract ($7.8 million average annual value) he signed July 3, 2009. He said Wednesday he would consider returning to Boston.
"Everything was positive," he said. "The organization was great, the guys were awesome, so it was a great chapter here and hopefully it can continue."
Riley Nash, 29, set NHL career highs in goals (15), assists (26) and points (41) completing a two-year, $1.8 million contract ($900,000 average annual value) signed July 1, 2016. Khudobin, 32, went 16-6-7 with a .913 save percentage and 2.56 goals-against average in 31 games as the backup to Tuukka Rask. He signed a two-year, $2.4 million contract ($1.2 million average annual value) July 1, 2016.
Other Bruins heading toward free agency are defenseman Nick Holden and forwards Tim Schaller, Brian Gionta and Tommy Wingels. Sweeney said he hasn't definitively ruled anybody out.
As for a player almost guaranteed to return to the Bruins next season, Sweeney said it was eye-opening for him to see how contrite forward Brad Marchand was Wednesday.
Marchand said he understands he must change his behavior, not just because of the six suspensions he's received from the NHL Department of Player Safety, but also because of the licking incidents with Toronto Maple Leafs forward Leo Komarov and Lightning forward Ryan Callahan during the playoffs. The incident with Callahan drew a reprimand from the NHL and the threat of supplemental discipline if it happened again.