The Wales striker only left Carrow Road for Pride Park this summer but has been linked with a surprise move to Charlton this week.
Doncaster revealed City would not benefit from any possible sell on fee after Derby activated a buy out clause in the frontman's Carrow Road contract to seal a £3.5million summer switch.
He told the Eastern Daily Press: "Whatever happens or doesn't happen will have no barring on us.
"The nature of that deal was the player left after Derby met the buy out clause in his contract. Derby agreed to sign the player for £3.5million and that is what we were entitled to receive.
"It's exactly the same situation which also occurred with Dickson Etuhu."