The Fijian Political Party, the SVT, says the early recall of Fiji's ambassador to Japan, Rishi Ram, is racial discrimination of the worst form.
Mr Ram is being recalled after less than a year into his three-year term to make way for a former politician, Ratu Tevita Momoedonu.
The appointment is seen as a reward for agreeing to become prime minister twice for a few minutes each time after the coup so he could recommend the dissolution of the elected parliament and legitimise the interim administration.
The SVT general secretary, Ema Druavesi, says Mr Ram is one of the most dedicated civil servants and the government's decision to terminate his appoinment prematurely is of concern.
Mrs Druavesi says more capable public servants will migrate overseas with the kind of treatment given to Mr Ram.
Mr Ram has decided to resign on his return rather than accept another job in the public service.