Ginobili posted a picture of himself with his paperwork on Twitter on Thursday, writing that: "Now it's official. I've just signed my fourth contract with the Spurs for two more years."
The 36-year-old from Argentina has won three titles with the Spurs and helped them reach the NBA Finals this season despite battling injuries.
General manager RC Buford calls Ginobili "an integral part of the Spurs family and the San Antonio community for the past decade" and says in a statement the Spurs are "thrilled that he'll spend his entire career as a San Antonio Spur."
Belinelli averaged 9.6 points in 73 games last season for Chicago.