34It is apparent from the case-law of the Court of Justice that Article 57(7) of Directive 2014/24 does not provide for uniform application at Union level of the exclusion grounds it mentions, since the Member States may choose not to apply those grounds, or to incorporate them into national law with varying degrees of rigour according to legal, economic or social considerations prevailing at national level. Member States therefore enjoy some discretion in determining the implementing conditions of the optional grounds for exclusion laid down in Article 57(4) of Directive 2014/24 (see, by analogy, judgment of 20 December 2017, Impresa di Costruzioni Ing. E. Mantovani et Guerrato, C‑178/16, EU:C:2017:1000, paragraphs 31 and 32).
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