MacLellan said the Capitals hoped to re-sign Chimera, who played in Washington for seven years, but couldn't meet his salary range.
"He's been a good player for us," MacLellan said. "Fun guy to have around, good personality. Disappointing to see him go, but sometimes you've just got to move on."
With Connolly in one of the open forward spots, MacLellan said he wants to give a prospect the chance to fill the other spot. He doesn't foresee the Capitals making any other moves.
"Ideally, unless something falls that's really attractive to us that we think can really help us and it's on a cheap contract, I would anticipate us keeping that spot for one of the young guys or rotating guys through that last forward spot," MacLellan said. "We're going to use that spot for some flexibility unless we see something attractive."
After signing Connolly, Washington has $8 million in cap space, according to General Fanager, with two restricted free agents, forward Marcus Johansson and defenseman Dmitry Orlov, to sign. Forward Tom Wilson, who would have become a restricted free agent, signed a two-year, $4 million contract on Thursday.