The Boston Celtics and Rajon Rondo are haggling over a contract extension. They have until Oct. 31 to reach an agreement or Rondo will become a restricted free agent next summer.

“I have no idea whether we’ll get something done [by the deadline],” Rondo said from the visiting locker room at Madison Square Garden. “It’s not something I’m worried about. It’s just not a big deal right now. Of course, I’d like to get it done, but if it doesn’t happen, I’m not going to lose any sleep over it.’’

It might actually be in Rondo’s best interest to wait until the season ends to negotiate a new deal. During last season’s playoff series with Chicago and Orlando, he nearly averaged a triple-double, notching 16.9 points, 9.8 assists and 9.7 rebounds a game. If he plays as well this season and helps the Celtics win their second ring in three years, he could command huge money on the free agent market, especially with so many teams clearing cap space for next summer’s free agent bonanza. If some of the would-be big spenders don’t land LeBron James, Dwyane Wade or Chris Bosh, they could be willing to give their money to Rondo.

Rondo understands that, which is one reason he won’t be bent out of shape if no deal is struck this month. It is not known how much Rondo is asking for, but a source said it’s not the maximum.

“My agent’s got a certain number in mind and if they don’t reach that, we’ll just wait,’’ he said. “I feel like if we win another title, obviously that helps my chances [of getting more money].’’