Rowley Douglas is considering an appeal to Great Britain Rowing after Phelan Hill was named as cox of the men's eight.
Douglas coxed the eight to gold at the 2000 Sydney Olympics but he has been overlooked in favour of Hill ahead of the World Cup series and the Olympics.
Hill was part of the crew that won silver at the 2011 world championships in Bled and is described by GB Rowing performance director David Tanner as Britain's preferred cox.
The final Olympic selection will be confirmed on June 6 but this selection is a strong pointer to the make-up of the GB Rowing squad.
Douglas, 34, has already discussed the issue with Tanner but he has not submitted a formal challenge to the selection made by men's head coach Jurgen Grobler.
"We have an appeals process which any rower is entitled to use," said Tanner.
"We have 52 athletes (in our training squad) so it's not surprising we have an appeal from time to time.
"Assessing a cox is quite a challenge but Phelan has done a very good job for the last two years. There is no dissatisfaction with him. He is the preferred cox."
