"It’s been in the works a little bit," said Chiarelli. "Part of it due to Marco’s physical recovery.
"Really, that’s the large part as to why we’ve delayed."
Chiarelli spoke about the difficulty of dealing a character player like Sturm.
"He’s obviously a really good person and...when I was an agent, I actually co-represented him, so there’s a relationship there, too," said the GM. "But it helps us with our cap situation and as far as what we got in return, it was classified as 'future considerations,' but really it’s nothing.
"Part of that speaks to the trading him now, versus trading him later on in the year, which we could have done also, but in fairness to Marco it’d be good to allow him to begin his journey, so to speak, at a place that is a good landing spot for him.
"Dean Lombardi drafted him and knows him quite well. They were looking for a player like that," he said.
In his Bruins career, the 32-year-old Sturm skated in 302 games with 106 goals and 87 assists for 193 points.
He began this season on injured reserve after suffering a knee injury in Game One of the Bruins/Flyers Eastern Conference Semifinal series on Saturday, May 1, 2010.
"He’s a good player," said Chiarelli of Sturm, who was perhaps best known for his overtime game-winner versus the Philadelphia Flyers in last season's Winter Classic at Fenway Park. "There’s obviously been a lot of speculation on what move we were going to do.
"Again, a difficult thing that we had to do, but part of the reality of the salary cap and it’s completed now...conditional on the medical examination, but I don’t anticipate a problem there."
Chiarelli made no bones about his reasoning regarding the move.
"Keep in mind the value of cap space," said Chiarelli. "That’s what you have to keep in perspective.
"I’m not trying to justify trading him for nothing. Of course you’d like to get a return for a good player, but that’s really the being able to do it now versus later, it helps both sides."
And Sturm lands in a place that needs his services.
"Here’s a team where there is a prior relationship with Marco, and they got him for cheap and they wanted to do it now," said Chiarelli. "So there was a lot of positive factors in this circumstance that we felt that we had to act on."