BOSTON – After deciding to bring back Boston’s aging Big Three for another run at the NBA title, Danny Ainge knew he needed to surround it with more talent.

The Celtics general manager settled on former Dallas Mavericks shooting guard Jason Terry as one of the key pieces. Terry has reportedly agreed to a three-year deal for $15 million that is only waiting for the NBA’s moratorium on free agent signings to be lifted Wednesday for the deal to be finalized.

Brandon Bass has reportedly agreed to a three-year deal that is also being held up until the signing date. That gives Boston back its third-leading scorer, a 6-foot-8 forward who averaged 12.5 points in his first season with the Celtics.

Terry, who is one of the league’s top three-point shooters, would not keep the Celtics from bringing back Ray Allen. Allen, 36, has also met with the Miami Heat, but salary cap rules allow Boston to offer him more money.

“We really want Ray to come back,” Ainge said this week. “Time will tell.”

That would keep the Big Three intact to try for a second NBA championship – the 18th for the league’s most-decorated franchise.

Terry, 34, came off the bench to average 15 points per game for Dallas last season. In his career, he has averaged 16.1 points and 4.7 rebounds.

Warsaw’s Plumlee signs with Pacers

The Pacers signed Miles Plumlee, their No. 1 draft pick. Terms were not released.

Plumlee, a 6-foot-10, 245-pound forward from Duke, was the 26th overall pick in the draft. The native of Warsaw averaged 6.6 points, 7.1 rebounds and 0.9 blocks per game as a senior for the Blue Devils. He won a national title with Duke in 2010.

Around the league

Point guard Jameer Nelson, 30, has a deal in principle to return to Orlando. … Hasheem Thabeet’s agent, Bill Duffy, confirmed that the 7-foot-3 center has agreed to a two-year guaranteed contract with Oklahoma City. … Cleveland signed first-round draft picks Dion Waiters and Tyler Zeller to their rookie contracts.