Celtics coach Doc Rivers said that a multiyear deal to bring him back was “basically done.’’

Rivers, who had a one-year option, said, “We have to figure out a couple of things, but we’ll get it done relatively quickly.

“I wanted to get this out of the way so we can concentrate on the summer and free agency. Everything should be done soon. We want to get this done as soon as possible so we can move forward.’’

Rivers believes the Celtics have unfinished business with the Big Three (Kevin Garnett, Ray Allen, and Paul Pierce) and Rajon Rondo.