The Oklahoma City Thunder's starting lineup that includes a pair of 22-year-old All-Stars in Kevin Durant and Russell Westbrook added another potential 20-something All-Star in Boston center Kendrick Perkins on Thursday. The Thunder traded forward Jeff Green, center Nenad Krstic and the Los Angeles Clippers' 2012 first-round pick to the Celtics in exchange for Perkins and guard Nate Robinson. In a separate deal, the Thunder traded shooting guard Morris Peterson and forward D.J. White to Charlotte in exchange for center Nazr Mohammed. A member of the 2008 NBA championship team, the 6-foot-10, 280-pound Perkins is in his eighth NBA season, but is just 26 years old. Perkins and Mohammed, also 6-foot-10, give the Thunder a much-needed inside presence. The exact arrival of the new players is not known, though it is extremely doubtful the deal will be finalized in time for any to play in the Thunder's Friday night game at Orlando. The Thunder hosts the Los Angeles Lakers at 1:30 p.m. Sunday. Perkins is expected to miss at least one week with a sprained medial collateral ligament in his left knee. He had surgery to his right knee last July to repair a torn anterior cruciate ligament suffered in Game 6 of last year's NBA Finals against the Lakers. Green, who is averaging 15.2 points and 5.6 rebounds this season, originally was drafted by Boston with the No. 5 overall pick in 2007. In a deal orchestrated by then 30-year-old Seattle SuperSonics general manager Sam Presti, the Celtics traded Green's rights to the Sonics in exchange for shooting guard Ray Allen, who has since become the NBA's all-time 3-point leader. That trade also included Wally Szczerbiak, Delonte West and a 2008 second-round pick from Boston, plus second-round pick Glen Davis from the Sonics. Now in the final stages of his rookie contract and after failing to agree to an extension offer earlier this season, Green becomes a restricted free agent at the end of the season. Perkins' expiring contract pays him $4,390,208 this season. Memphis selected Perkins with the 27th overall pick in the 2003 draft out of Clifton J. Ozen High School in Beaumont, Texas, and then traded him to the Celtics. Perkins has played just 12 games this season and is averaging 7.3 points and 8.1 rebounds in 26.1 minutes. His career averages are 6.4 points and 6.0 rebounds in 22.3 minutes. The Thunder's acquisitions at center also will allow 6-foot-10, 235-pound Serge Ibaka to become a starter at his more natural power forward position. Off the bench comes 6-foot-10, 250-pound veteran enforcer Nick Collison. Collison and Ibaka likely will start during the transition period, or until Perkins is healthy enough to return. Mohammed has started 30 of 51 games this season with the Bobcats, averaging 7.3 points and 4.9 rebounds in just 16.7 minutes. The athletic, 5-foot-9 Robinson won three NBA dunk competitions during All-Star Weekend and is a career 35.4-percent shooter from 3-point range. The 26-year-old Robinson played collegiately at Washington, was selected 21st overall by the Phoenix Suns in 2005 and was traded to the Knicks. He has career averages of 11.3 points, 2.6 assists and 2.6 rebounds. He has 72 starts in 393 career games. Robinson is signed through 2011-12 at $4.2 million this season and $4.5 million next season. The 7-foot Krstic was picked 24th overall in 2002 and played four seasons in New Jersey Nets and spent the last three seasons with the Thunder. He is averaging 10.1 points and 5.4 rebounds in his career. The 27-year-old Krstic is in the final year of his contract that pays him $5.8 million this season. The 33-year-old Peterson is in the final year of a deal that pays him $6,641,440. The 33-year-old Mohammed is at the end of a deal that pays him $6,883,800.