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No, loan players generally do not count as "club-trained" for UEFA squad registration purposes. While on loan, a player's time at another club does not contribute to the three seasons required to be considered club-trained. To be considered club-trained, a player must be registered with the same club for three full seasons (or 36 months) between the ages of 15 and 21.
Den har brukt UEFAs egne retningslinjer som kilder bl.a.