The Nets are considering a 'significant offer' for O.J. Mayo if they are unable to trade for Joe Johnson, according to sources.

Mayo is an unrestricted free agent after four seasons with the Grizzlies.

The Celtics, Pacers and Suns will also be in the mix for Mayo, according to Ken Berger..

Kevin Garnett has informed the Celtics that he will return to the team for his 18th NBA season.

According to two sources, Garnett and the Celtics are working on a three-year, $34 million deal.

“The decision came down to whether KG wanted to keep playing,” said one source. “And once he decided that he did, it was going to be Boston. He wasn’t going to leave Doc (River) and those guys and play anywhere else.”

Danny Ainge revealed that Jared Sullinger has a herniated disk.

"There are some issues there," said Ainge. "Our medical staff thinks that short-term and long-term there may be some maintenance issues with the back. Doc Rivers played with a herniated disk for 13 years. It may need surgery at some point, it may not."

Sullinger’s back issue was red-flagged prior to the draft, but Ainge said the team was comfortable taking him.

"Length is an issue," said Ainge. "He has good width. There were a lot of these same kinds of issues with Glen Davis when he came into the league. Guys that are smart and have a good touch make the adjustment."

The Miami Heat are expected to pursue Ray Allen in free agency and LeBron James began the recruitment process during the Draft.

James wrote the following on Twitter:

"While watching the Draft my son Bryce ask 'Is Ray Allen gonna play for the Heat'. I said 'I don't know, I hope so'."

The Celtics are expected to pursue a sign-and-trade for O.J. Mayo, according to sources.

Boston will be willing to offer Brandon Bass to the Grizzlies in exchange. Bass opted out of his deal and will be a free agent.

The Celtics are attempting to package the No. 21 and No. 22 picks to move up into the lottery.

One of their motivations and targets is Austin Rivers, according to sources.

Rivers is the son of head coach Doc Rivers.

The Celtics have been aggressively attempting to move up in the draft by packaging the 21st and 22nd picks, according to sources.

Boston aims to work into the late lottery if not higher.

Danny Ainge refuted a report indicating the Celtics made a promise to draft Royce White.

"As a general rule I do not make promises," Ainge said. "I have before, it’s been a while, and we did not make a promise, no. On draft day I’ll have 10 contingency plans and we’re exploring all the trade possibilities and if you make a commitment you’re just taking yourself out of that game. You better be sure you have a chance to get that player."

Ainge is confident the Celtics can find value with 21st and 22nd picks in the draft.

"We have our rankings and I’m aware of all the mock drafts and what people are prognosticating. We have our rankings and that’s really all I care about," Ainge said. "We don’t consider them sliding, they’re still available to us. That’s been the case before in the past. That was the case with Delonte West and Rajon Rondo Rondo and Avery Bradley. Those guys were still there, we had them rated much, much higher."

Doc Rivers believes Kevin Garnett will return for an 18th NBA season.

“I hope he comes back, and I think he will,” said the Celtics’ coach. “I have no basis for that. I just believe that he will.”

Rivers added that Garnett and his people have been in contact with Danny Ainge and are discussing the particulars.

The Celtics have been awarded a 2013 second round draft pick from the Thunder as compensation for a dispute over Jeff Green's medical condition, according to sources.

Boston filed a complain with the NBA after Green was revealed to have a heart condition.

Oklahoma City will convey Charlotte's second round pick in 2013, according to a source.