53Such measures could be allowed only as a derogation expressly provided for by Article 39(3) EC or if they pursued a legitimate aim compatible with the Treaty and were justified by pressing reasons of public interest. But even if that were so, application of those measures would still have to be such as to ensure achievement of the aim in question and not go beyond what is necessary for that purpose (see, in particular, Bosman paragraph 104, and Case C-224/01 Köbler [2003] ECR I-10239, paragraph 77).
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