Linking member (physical person) to another member (sports club)

I am trying to link a competitor to a sport club using the option to add [Complementary attributes (member)] in Members module setup following the examples (Societe:societe/class/societe.class.php) as follows:
Adherents:adherents/class/adherent.class.php
(sure incorrectly)
Please suggest the correct way to link two members (one to many; one sports club to many competitors)?

Unfortunately not possible. There is no way for a multiple choice with objects.
A workaround can be to use multiple choice from database table entries. I do so, but it is no good solution.

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