The invention relates to a method for optimizing the quantity of network resources and the number of services likely to use said resources in a virtualized telecommunications network comprising the following steps of: evaluating similarities between the services likely to use said resources in terms of the virtual network functions VNFs required for the instantiation of each service, gathering services as a function of their similarities in order to maximize resource sharing, calculating additional resources to accept services awaiting instantiation; running an admission control scheme to accept or reject requests for the instantiation of new services.