Porto president Jorge Pinto da Costa says Chelsea must pay the buyout clauses of any players Andre Villas-Boas wishes to take with him to London.
New Blues boss Villas-Boas is expected to lure striker Radamel Falcao and playmaker Joao Moutinho.
But Pinto da Costa insists they will have to pay the full £62million for them.
He said: "If there are termination clauses we have to prepare for the possibility that a player will leave at the value set out.
"But I am not going to negotiate that price with anyone.
"As with Villas-Boas, there was no conversation with Chelsea, just the money paid into our account to release him."
