The Boston Celtics have reached agreement with Dallas Mavericks free-agent guard Jason Terry on a three-year contract, league sources told Yahoo! Sports.

The Celtics will use their $5 million mid-level exception to sign Terry. The total value of the contract will be $15.6 million.

Terry spoke with Celtics president Danny Ainge and coach Doc Rivers on the first day of free agency Sunday. Rivers told Yahoo! Sports he hopes Boston can still re-sign Ray Allen, in addition to adding Terry. The Celtics have also already reached agreement with Kevin Garnett on a three-year, $34 million contract.

Free agents can sign contracts on July 11.

Terry averaged 15.1 points and 3.6 assists while shooting 37.8 percent from 3-point range last season for Dallas. Terry, 34, often expressed frustration about not being signed to a contract extension after being a key member of the Mavericks' 2011 NBA championship team.



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