The Blues have opened their official global search for a new head coach with an answer expected by the end of next month.
Restrictions have been eased to allow any coach to apply for the role, rather than just those with recent experience in New Zealand.
International coaches such as Nick Mallett, Martin Johnson, John Kirwan, Eddie Jones, John Mitchell, Robbie Deans, Kieran Crowley, Jake White and Peter de Villiers could all apply.
The change came after consultation between the New Zealand Rugby Union and the Blues, which led to advertisements on the NZRU website, Sport NZ and national newspapers this weekend.
Sources said the Blues have been fielding inquiries from sporting agents and prospective coaches about the franchise's needs and plans for next season.