EUOSHA/2021/OP/F/SE/0142  By filling in the form available in  Annex VII , tenderers are required to give an indication of the proportion  of the contract that they intend to subcontract, as well as identify and describe briefly the envisaged  contractual roles/tasks of subcontractors meeting any of the following conditions (hereafter referred to  as  identified subcontractors ): Any such subcontractor must provide the tenderer with a commitment letter drawn up in the model  attached in  Annex IX-1  and signed by its authorised representative. Changes concerning subcontractors identified in the tender (withdrawal/replacement of a subcontractor,  additional subcontracting) during the procurement procedure (after the submission deadline and before  contract signature) require the prior written approval of the  contracting authority , subject to the following  verifications:  Subcontracting to subcontractors identified in a tender that was accepted by the  contracting authority and resulted in a signed contract is considered authorised.  In order to fulfil the selection criteria, a tenderer may also rely on the capacities of other entities,  regardless of the legal nature of the links it has with them. It must in that case prove that it will have at  its disposal the resources necessary for the performance of the contract by producing a commitment  letter in the model attached in  Annex IX-2 , signed by the authorised representative of such an entity,  and supporting evidence that those other entities have the respective resources.  If the contract is awarded to a tenderer intending to rely on another entity to meet the minimum levels  of economic and financial capacity, the  contracting authority  may require the entity to sign the contract  or, alternatively, provide a joint and several first-call financial guarantee for the performance of the  contract.  With regard to technical and professional selection criteria, a tenderer may only rely on the capacities  of other entities where the latter will perform the works or services for which these capacities are  required (i.e. the latter will assume the role of subcontractors).  3.4.3  Entities on whose capacities the tenderer relies to fulfil the selection criteria  • the terms of the originally submitted tender are not altered substantially, i.e. all the tasks  assigned to the former subcontractor are taken over by another  involved entity ; the change  does not make the tender non-compliant with the tender specifications; and the evaluation  of award criteria of the originally submitted tender is not modified.  • the tenderer still fulfils the selection criteria and the new subcontractor fulfils the selection  criteria applicable to it individually, if any;  • any new subcontractor is not in an exclusion situation;  • those whose individual share of the contract, known at the time of submission, is above  10 %.  • those on whose capacities the tenderer relies upon to fulfil the selection criteria as  described under  section 4.2 ; 44 