limiting the drop down option of a one-to-one relationship in the admin app. is that possible ?

I currently have a model that looks like this

class modelStudent(models.Model):

    user = models.OneToOneField(User, on_delete=models.CASCADE,null=True, blank=True)

    school           = models.ForeignKey(modelSchool)

Now I also have a modelStudentAdmin of the above model which basically filters out the data seen by the user. The code looks like this

class modelStudentAdmin(admin.ModelAdmin):

    def get_queryset(self, request):

        qs = super(modelStudentAdmin, self).get_queryset(request)

        if request.user.is_superuser:

            return qs

        else:

            # Get the school instance

            schoolInstance = modelSchool.objects.get(user=request.user)

            qs = modelStudent.objects.filter(school=schoolInstance)

            return qs

admin.site.register(modelStudent,modelStudentAdmin)

now my question is in the admin when the user attempts to create a new modelStudent for the field "user" all available users are shown in the drop down. My question is if there is a way for me to limit/restrict that drop down to a certain value or (set that drop down value to something and then have the drop down disabled) ? I only want people creating modelStudentAdmin under their respective user field.

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