Free-agent forward Kris Humphries has agreed to a three-year, $13 million deal with the Washington Wizards, league sources told Yahoo Sports.

The Boston Celtics are finalizing a sign-and-trade agreement with Washington to fit Humphries' deal into the salary cap, sources said. The Wizards can send Boston part of the trade exception earned with Houston in a recent sign-and-trade deal for Trevor Ariza.