Django Admin football game registration

Question

Help me please. I’m learning Django.

I have a website that registers games from my hometown. It follows example to understand doubt:

Championship: Vacation 2017

Has 2 groups (Group 1 and Group 2)

I registered 6 times(São Paulo, Barcelona, Palmeiras, etc ...)

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In group 1 are the teams: Arsenal, Botagogo, and Cruise

In group 2 there are the teams: Palmeiras, Real Madrid and São Paulo

My question is: When I select group 1, it lists only teams in group 1 to "play each other" by Django Admin

See in the photo below, first select the group (in the case group 1).

In the list of teams, comes all teams, even the group 2

follows sources:

admin.py

class JogoAdmin(admin.ModelAdmin):
    fields = ('grupo', 'data_jogo', 'estadio', 'clube_casa', 'clube_visitante', 'gols_casa', 'gols_visitante', 'jogo_realizado', )

model.py

class Jogo(models.Model):
    grupo = models.ForeignKey(Grupo, on_delete=models.CASCADE, related_name='jogo_grupo')
    data_jogo = models.DateTimeField()
    estadio = models.ForeignKey(Estadio, on_delete=models.PROTECT, related_name='jogo_estadio')
    clube_casa = models.ForeignKey(Clube, related_name="jogo_clubecasa", on_delete=models.PROTECT)
    clube_visitante = models.ForeignKey(Clube, related_name="jogo_clubevisitante", on_delete=models.PROTECT)
    gols_casa = models.IntegerField(default=0)
    gols_visitante = models.IntegerField(default=0)
    jogo_realizado = models.BooleanField(default=False)
    data_cadastro = models.DateTimeField(auto_now_add=True)

class GrupoClube(models.Model):
    # Aqui é onde cadastro os times nos grupos
    grupo = models.ForeignKey(Grupo, on_delete=models.CASCADE, related_name='grupoclube_grupo')
    clube = models.ForeignKey(Clube, on_delete=models.CASCADE, related_name='grupoclube_clube')
    data_cadastro = models.DateTimeField(auto_now_add=True)

complete source in: https://github.com/leonardocintra/campeonato