The AP reports:

Doc Rivers agrees to five-year contract extension with Boston Celtics

Boston Celtics general manager Danny Ainge was approaching his postseason news conference when his cell phone rang.

He smiled and told reporters it was from his new coach, then ducked into the nearby workout room to take the call. But he was only half-joking: It was Doc Rivers calling, and he had just agreed to a five-year contract extension that would not only give him another run at a title with the current roster but keep him in Boston to help rebuild the franchise when the Big Three era is done…

Rivers contract was set to expire - he had an option for next season - and he said after the Celtics were eliminated by the Miami Heat on Wednesday night that he was “leaning heavily” toward coming back. But he was expected to return on a short-term deal to make one more run at a title with the Big Three of Kevin Garnett, Paul Pierce and Ray Allen.

Instead, the five-year contract worth a reported $35 million would give him the chance to lead the franchise with a rebuilt roster that probably won’t include any of the thirtysomething stars who led Boston to its 18th NBA title - and Rivers’ first - in 2008.