98It is also in accordance with the Court’s settled case-law that, in view of the mandatory nature of the supervision of State aid by the Commission pursuant to Article 108 TFEU, undertakings to which aid has been granted may not, in principle, entertain a legitimate expectation that the aid is lawful unless it has been granted in compliance with the procedure laid down in that article, and furthermore, an economic operator exercising due care should normally be able to determine whether that procedure has been followed. In particular, where aid is implemented without prior notification to the Commission, with the result that it is unlawful under Article 108(3) TFEU, the recipient of the aid cannot have at that time a legitimate expectation that its grant is lawful (judgments of 15 December 2005, Unicredito Italiano, C‑148/04, EU:C:2005:774, paragraph 104, and of 19 March 2015, OTP Bank, C‑672/13, EU:C:2015:185, paragraph 77).
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