Pumas get Tri-Nations go-ahead

RUGBY UNION: Argentina have been invited to join South Africa, Australia and New Zealand in an expanded Tri-Nations Championship from 2012.<br /><br />The Pumas are currently ranked sixth in the world having finished third in the 2007 World Cup.<br /><br />The invitation still needs to be formally approved by the broadcasters of the Tri-Nations governing body SANZAR.<br /><br />But Argentina Rugby president Porfirio Carreras described the conditional invitation as &ldquo;momentous&rdquo;.