"I think Doc is the best coach in the league, so I think it's great for us, to have him around," Ainge said.
The value of the contract is $35 million over the five years, according to sources.
Now, with Rivers in the fold, it appears the Celtics will have both their coach and their Big Four core of Rondo, Ray Allen, Paul Pierce and Kevin Garnett for one more run at a world title.
But Ainge is thrilled to have Rivers well beyond that as well.
"Doc wants to be here," Ainge said. "It's not all because he thinks that over the next five years we're going to have the best team in the NBA. He feels like he's part of this franchise, he likes working here, and he's willing to do whatever it takes to help us be successful."
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