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How to get __r .name relationed records from Trigger.new ?

I am unable to get the value from below contact. how we can get the related field data ?

trigger NIGO_update on NIGOs__c(before insert,before update)

     for(NIGOs__c ng:Trigger.new){
    NIGOs__c nigo = Trigger.newMap.get(ng.Id);
            if(ng.Product_Type__c != 'Forecare'){
            if(ng.Contact_Name__c != Null){

                ng.External_Wholesaler__c = ng.Contact_Name__r.Annuity_Territory_Wholesaler__r.id; (Here i am getting Null Value)