Boriša Simanić -- a 25-year-old member of Serbia's national team -- had to have his kidney removed over the weekend ... after the power forward was injured during a play in a FIBA World Cup game last week.
Simanić had been guarding South Sudan's Nuni Omot during their contest in the Philippines on Aug. 30 ... when Omot appeared to accidentally elbow the big man right in his side.
Simanić --- a member of the Utah Jazz's summer league team last year -- doubled over in pain ... and hours later, he required emergency surgery at a local hospital to fix the issues the inadvertent collision caused.
Unfortunately, Serbian coach Svetislav Pesic said Simanić suffered a setback in his recovery over the weekend ... and according to Serbian team officials, he then had to have one of his kidneys removed on Sunday.
He's expected to remain in the Philippines for the foreseeable future while he heals.
For his part, Omot released a statement Monday saying he had no intentions whatsoever of hurting Simanić.
"As a sportsman, I firsthand understand the severity of his situation and I am deeply sorry that this happened," Omot said. "No player should have to go through that. I pray for Simanić's recovery and speedy return to the court."
🇷🇸Serbia's basketball players and fans chanting for Borisa Simanic who had to have a kidney removed after being elbowed in their World Cup match with South Sudan.pic.twitter.com/nj0HbCnRjM