36In order to assess whether an undertaking that is not present in a market is a potential competitor of one or more other undertakings that are already present in that market, it must be determined whether there are real and concrete possibilities of the former joining that market and competing with one or more of the latter (see, to that effect, judgment of 28 February 1991, Delimitis, C‑234/89, EU:C:1991:91, paragraph 21).
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