Boriša Simaniu0107 -- 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.
Simaniu0107 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.
Simaniu0107 --- a member of the Utah Jazz's summer league team last year -- doubled over in pain .