The 29-year-old was initially suspended in 2018 after failing a drug test, but he alleged foul play, saying his blood sample may have been tampered with.
On Saturday, the Athletics Integrity Unit (AIU) upheld that ban, concluding that the case had been “convincingly made out.”
Following that verdict, Kiprop maintained that he was innocent, saying he had actually been at the forefront in the fight against doping in athletics.
“The decision is not only a blow to me, but it is not good for the sport of athletics,” AFP quotes Kiprop.
“I have been insisting that I did not dope,” he said. “I will continue to maintain my innocence, even if this decision now means I will not be eligible to run again for the next four years.
“It’s sad that the world will believe that I am guilty of taking the performance-enhancing drugs and yet I have been at the forefront of fighting doping in the sport.”
Kiprop’s ban is dated from 3 February 2018, and can be appealed should Kiprop deem it fit to do so.
