Adrian Wojnarowski of ESPN reported the news.
Belinelli, 32, spent time with the Atlanta Hawks and Philadelphia 76ers in the 2017-18 season, averaging 12.1 points per game while shooting 37.7 percent from three. He was a crucial addition for the Sixers on the buyout market, giving the team a much-needed offensive boost off the bench in their run to the postseason.
While Belinelli remains a liability at times on the defensive end, his ability to drain shots from the perimeter, work off screens and hit off-balance attempts makes him an instant jolt of offense in a reserve role.
He thrived in the Sixers' fast-paced, pass-heavy offense, averaging 18.4 points per game in seven April contests while shooting an impressive 43.1 percent from three. While he cooled off a bit in the postseason, his 16.6 points per game in the team's first-round matchup against the Miami Heat—including two games with 21 or more points—was a key factor in the young Sixers winning their first playoff series since the 2011-12 campaign.
Utilizing Belinelli in a similar role by running action for him to get him open looks will be vital for San Antonio. His addition isn't a splashy one, but he'll ensure that the Spurs still have some punch on offense while the starters rest.