35In order to answer that question, it must be observed that Directive 2004/17 does not lay down any rules specifically relating to alterations made to the composition of a group of economic operators that has been pre-selected as a tenderer for a public contract, and consequently rules about such a situation are a matter for the Member States (see, to that effect, judgment of 23 January 2003, Makedoniko Metro and Michaniki, C‑57/01, EU:C:2003:47, paragraph 61).
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