 When this case occurs, two highly ranked contenders may fight for an interim championship of the same weight division – leading to two champions existing in the same weight division simultaneously.Once the original champion is able to return, at the discretion of the sanctioning body concerned, they must defend their title against the interim champion - who will relinquish their interim title in order to fight for the full world title.If the original champion cannot return, refuses to defend their title or transfers to a different weight division, the interim champion is then promoted to full championship status.