Usain Bolt has accused Justin Gatlin of being disrespectful in making comments regarding the Jamaican's medical exemption to feature at Rio 2016.
Bolt pulled out of his national trials through injury, but was still chosen for the team to travel to Brazil.
Gatlin, Bolt's main rival for 100-metre gold in Rio, felt the six-time Olympic champion was being given preferential treatment, something he would not have received in the United States.
And Bolt, who won the 200m at the Diamond League in London on Friday in a time of 19.89 seconds, has taken exception to Gatlin's remarks.
"For me I felt it was a joke, I felt it was a disrespect they think I'd back out of a trials," said Bolt.
"I've proven myself year on year that I'm the greatest. I laughed when I heard it, I was disappointed, especially in Justin Gatlin."