Judgment of the Court (Eighth Chamber) of 13 June 2019.#Cátia Correia Moreira v Município de Portimão.#Request for a preliminary ruling from the Tribunal Judicial da Comarca de Faro.#Reference for a preliminary ruling — Directive 2001/23/EC — Transfers of undertakings — Safeguarding of employees’ rights — Concept of ‘worker’ — Substantial change in working conditions to the detriment of the employee.#Case C-317/18.