The Londoners have made no secret of their desire to create the role, and Spaniard Ayesteran - who left Anfield earlier this season - was strongly linked with the position this week.
But Curbishley, 50 yesterday, insists West Ham are only in the early stages of the selection process - and denies that the new man will affect his control of the first-team squad.
Curbishley said: "We've discussed the situation and we're coming up with a brief for what the job entails.
"No one has been in the frame, or even talked about. We're hoping to push on with a new stadium and training ground, and we need someone who can deal with it."