Johnson, a second round draft pick by Detroit in 2005, started 24 games for the Pistons and averaged 3.5 points and 3.7 rebounds. He is also in the final year of his contract, but makes slightly more than Oberto's $3.5 million, which is partially guaranteed.

Bowen was a key cog in helping the Spurs win three championships, relishing his role as a shutdown defender tasked with guarding the best player on the floor. But the 38-year-old lost a step and saw his minutes cut significantly.

Bowen lost the starting job he held for six seasons and didn't earn a spot on the NBA's all-defensive team for the first time since the 1999-2000 season. He could still find his way back to San Antonio if the Bucks choose to waive the 13-year veteran.

Thomas, 36, is a 14-year veteran who averaged 4.3 points and 5.1 rebounds off the bench last season. Oberto, 34, spent four years in San Antonio and underwent a procedure earlier this month to correct an irregular heartbeat.

Jefferson gives the Spurs the additional scorer they craved in April, when the Dallas Mavericks ousted San Antonio the playoffs in five games. The Spurs were little more than a two-man show of Parker and Duncan, and coach Gregg Popovich said afterward that his team simply couldn't match firepower.

Jefferson spent his first seven seasons in New Jersey and hasn't missed a game the past two seasons. He shot a career-high 39.7 percent from 3-point range last season.