Marcus Denmon broke the fifth metatarsal in his right foot in Chalon-Elan's season opener.
Chalon head coach Gregor Beugnot spoke on Denmon's injury and fears it is worse than expected.
"It is on the side of the foot on a metatarsal," said Beugnot. "I hope he has not broken his foot. He may have moved a metatarsal, or there is something. I hope there will be examinations fast."
Denmon was drafted by the Spurs in 2012.