Sweeney said that he has been pleased with the play of young wingers Peter Cehlarik and Karson Kuhlman in top-six roles - both were assigned to Providence on Monday afternoon - but that the team needed more depth, especially with the news that Pastrnak (thumb surgery) would be out for at least two more weeks.
"It's not an indoctrination of Cehlarik and/or Kuhlman that we have roster flexibility," said Sweeney. "They've done a great job and worked their way into being a big part of our group. But I think overall, we all acknowledged internally that we could use a little more depth."
Pastrnak skated on Monday for about 15 minutes without a stick, marking the first time since his thumb procedure that he took the ice. Still Boston's leading goal scorer (31) after missing the last six games, the winger will be in a cast for at least the next two weeks, before transitioning into a splint.
"Then it's a matter of comfort," Sweeney said of a potential return. "When he's able to be the most comfortable. He won't have any restrictions at that point in time…he's a tough kid that wants to play hockey. You already saw him skating today. The first thing he said to me is, 'I'll be back sooner than anyone expects.'
"And I think he'll be perfectly fine. It'll be a little bit different just because he's had a procedure done, but he'll get past it. He'll be fine. I spoke with the doctor today, and he feels great about where David's at."
After surrendering a first-round pick at last season's deadline as part of the package for Rick Nash, Sweeney admitted to being hesitant at moving another first-rounder, as well some of the Bruins' top prospects, saying it was "really important" to hold onto those assets. At the same time, Sweeney felt inclined to add secondary scoring, which he was able to do by moving lower picks and nothing off the current roster.
"We were in on a bunch of things to explore what we would have liked to improve our club for now and moving forward, without necessarily handcuffing ourselves and continuing to keep a long-term vision in place," said Sweeney, who acquired Coyle from Minnesota last Wednesday for Ryan Donato and a conditional fifth-round pick. "But we're also trying to win…we also were looking for a player that would be excited to join our club…and I think he's happy with knowing where our club is at currently and the fact that he goes right into a competitive atmosphere."