Green is open to an extended stay

The Celtics acquired Jeff Green because of his youth, versatility, and the ability to re-sign him this summer. Green will give the Celtics every chance to bring him back, according to his agent, David Falk.

Green is a restricted free agent next season, meaning, under the current collective bargaining agreement, the Celtics can match any offer made to the fourth-year swingman. They didn’t have such rights with Kendrick Perkins, who was an unrestricted free agent.

After a month in Boston, Green is getting accustomed to the atmosphere and appears comfortable enough to make a long-term commitment.

“First of all, I have a very longstanding friendship with Doc [Rivers] and Danny [Ainge],’’ Falk said after the Celtics beat the Knicks, 96-86, last night at Madison Square Garden. “You got a championship-caliber team, three Hall of Famers and [Rajon] Rondo really coming into his own.’’

The CBA expires June 30 and it’s unclear what rules will be in place when the Celtics and Green are allowed to negotiate.

“There’s a lot of uncertainty because no one knows what the rules are going to be, so I told [Green] I don’t want him to spend one nanosecond thinking about next year,’’ Falk said. “I want him thinking about how he can help the team be a factor in the playoffs. And I think he needs to take the next 30 games to get acclimated, learn the plays, get to know how the guys play and I think he can help them in the playoffs.’’

Falk said Green, who is averaging 11.2 points in 13 games, is a good fit in Boston.

“Jeff is a thinking-man’s player and Doc is a thinking-man’s coach,’’ he said. “He wasn’t looking for a new situation. He wasn’t asking to be traded. I think both players [Green and Perkins] were traded because of economics. He was drafted by Boston, a Big East guy, lives in Washington and he’s very excited, learning a lot and can’t ask for a better environment and win a title in his fourth year.

“Of course [he’d be interested in staying in Boston]. He’s in a great situation . . . He’s a Celtic kind of a guy. He just wants to win.’’