The Boston Celtics have signed Jamar Smith.

Smith, a 6’3” guard, appeared in 44 games last season for BK Prostov in the Czech Republic and averaged 14.8 points and 2.5 assists while shooting 39.3% from three-point territory during league games.

Smith also appeared in two games during EuroCup qualifications and in six games of the EuroChallenge. Smith played for the Celtics during the 2012 Orlando Summer League and averaged 9.2 points while shooting 45.0% from three. Smith was previously with the Celtics during training camp prior to the start of the 2010-11 season. Smith previously played for the Maine Red Claws of the NBA Development League. He played collegiately for the University of Illinois and the University of Southern Indiana.

The Celtics have signed Dionte Christmas.

Christmas, a 6’5” guard, appeared in 26 games during the 2011-12 season for AGO Rethymno Aegean in Greece and averaged 18.6 points, 4.4 rebounds, 3.0 assists and 1.6 steals per game. He shot 36.0% from three point territory and 46.3% from the field overall. He was an Honorable Mention All-American at Temple during his senior year (2008-09) and was named the Most Outstanding Player of the Atlantic 10 Tournament. Christmas played for the Celtics during their 2012 Summer League teams in Orlando and Las Vegas.

The Boston Celtics have signed free agent center Jason Collins. 

“Jason’s ability to defend in the post will be a great addition to this team,” said Danny Ainge.

Collins, a 7’0” center, averaged 1.3 points and 1.6 rebounds in 10.3 minutes per game last season with the Atlanta Hawks.

Jeff Green has agreed to the framework of a four-year, $36 million deal with the Celtics.

"I expect it will be done imminently," Green's agent David Falk said. "Just some collective bargaining issues that changed. Just some details stuff, nothing serious."

Green missed all of last season after undergoing surgery to repair a heart abnormality.

Mickael Pietrus is open to a return to the Celtics, but will not sign for the veteran minimum salary.

“MP will not play for the veteran’s minimum. Period,” said Bill McCandless, Pietrus’ agent. “It’s not happening. That’s the beginning, middle and end of that. … He is not a veteran’s minimum player. There’s no chance he’ll ever sign for that.”

Pietrus signed off on the $1.22 million minimum after being waived by the Suns this past season, but the nine-year veteran has “a standing offer triple that overseas,” McCandless said.

McCandless has had serious discussions with several NBA teams, including one Monday, “and the money was much more than the veteran minimum.

“I’ve had the veteran minimum thrown at me like hubcaps,” added McCandless. “In this collective bargaining agreement, a component of any player’s wishes and desires is the money teams are willing to pay.”

Keyon Dooling has agreed to terms of a one-year deal with the Celtics.

Dooling will sign a one-year, veteran-minimum deal, according to his agent.

Dooling averaged 4.0 points and 1.1 rebounds in 14.4 minutes for the Celtics last season.

The following 36 NBA players are currently under contract for the 12-13 season and are on their respective country's Olympic rosters:

Atlanta Hawks - no players

Boston Celtics - no players

Brooklyn Nets - Deron Williams (USA)

Charlotte Bobcats - no players

Chicago Bulls - Luol Deng (Great Britain)

Cleveland Cavaliers - Anderson Varejao (Brazil)

Dallas Mavericks - no players

Denver Nuggets - Timofey Mozgov (Russia)

Detroit Pistons - no players

Golden State Warriors - no players

Houston Rockets - no players

Indiana Pacers - no players

Los Angeles Clippers - Chris Paul (USA)

Los Angeles Lakers - Kobe Bryant (USA), Pau Gasol (Spain)

Memphis Grizzlies - Marc Gasol (Spain) 

Miami Heat - LeBron James (USA)

Milwaukee Bucks - no players

Minnesota Timberwolves - Kevin Love (USA), Alexey Shved (Russia)

New Orleans Hornets - Anthony Davis (USA), Al-Farouq Aminu (Nigeria)

New York Knicks - Carmelo Anthony (USA), Tyson Chandler (USA), Pablo Prigioni (Argentina)

Oklahoma City Thunder - Kevin Durant (USA), Russell Westbrook (USA), James Harden (USA), Serge Ibaka (Spain)

Orlando Magic - no players

Philadelphia 76ers - Andre Iguodala (USA)

Phoenix Suns - Luis Scola (Argentina)

Portland Trail Blazers - Nicolas Batum (France), Victor Claver (Spain), Joel Freeland (Great Britain)

Sacramento Kings - no players

San Antonio Spurs - Tony Parker (France), Manu Ginobili (Argentina), Boris Diaw (France), Tiago Splitter (Brazil), Patty Mills (Australia), Nando De Colo (France)

Toronto Raptors - Jose Calderon (Spain), Jonas Valanciunas (Lithuania), Linas Klezia (Lithuania)

Utah Jazz - no players

Washington Wizards - Nene (Brazil), Kevin Seraphin (France)

• Click here to view the full Olympic rosters.

The Clippers beat the Celtics by a final score of 92-77 in Summer League play on Sunday.

Adam Morrison scored 26 points on 9-for-15 shooting for Los Angeles. Talor Battle had 17 points and seven assists, and Gary McGhee had 10 points and six rebounds.

Jared Sullinger scored 13 points on 5-for-10 shooting for the Celtics. Craig Brackins had 11 points and six rebounds, while Jonathan Gibson had 14 points.

The Celtics are closing in on a one-year, veteran-minimum deal with Jason Collins.

A 11-season NBA veteran, Collins owns career averages of 3.8 points and 3.9 rebounds per game.

Boston will pay $854,389 toward Collins’ one-year deal, while the league will pick up the rest of his $1.35 million salary as a veteran with more than ten years of experience.

The Bucks beat the Celtics by a final score of 88-87 in Summer League play on Saturday.

Tobias Harris had 22 points and seven rebounds for Milwaukee. John Henson had 22 points and nine rebounds and Larry Sanders had 11 points and 15 boards.

Dionte Christmas had 17 points, seven rebounds and six assists for Boston. Jared Sullinger had 16 points and 11 boards and Jamar Smith had 16 points on 5-for-16 shooting.