Bernie Ecclestone has admitted F1 engine makers are right to be concerned about Gilles Simon's appointment by the new 2014 supplier Pure.
Pure, headed by former BAR founder Craig Pollock, announced last month that it has signed Frenchman Simon as technical director.
Former Ferrari engine boss Simon's most recent post has been at the FIA, where he has overseen the early stages of the engine suppliers' new rules for the post-V8 period.
Renault Sport F1's Rob White admitted the appointment is a "concern to all of us (suppliers) that in this close relationship with Gilles ... we've given unprecedented access to him".
Asked about the controversy, F1 chief executive Ecclestone started by insisting that Simon can move "if the contract (with the FIA) says he can".
"Of course, it's not very good that he can leave the FIA and go back to working as an engineer when he has in his hands all the information about all the teams.
"No, it's not very correct," the Briton is quoted as saying by La Gazzetta dello Sport.