"We are not that far away from the World Cup and we are taking the attitude of what do we need to do to be successful? We felt we needed a greater presence in our analysis of the opposition. We have looked at the people within the group who are best suited for that role and Aussie McLean is the guy we think is best suited.
"I'll take over his defensive coaching duties. That's the big coaching change we have made."
An announcement is expected to be made shortly to confirm that McLean as well as forwards coach Mike Cron, skills coach Mick Byrne and assistant coach Ian Foster have earned contract extensions through to the World Cup.
Hansen's contract was extended midway through last year but the New Zealand Rugby Union held off reappointing the wider coaching team. They wanted to see performance and results in 2013 before making that commitment. The All Blacks' perfect season, the quality of the team's performances and the players' generally positive feedback about the coaching team eliminated any doubt about the outcome.
But, despite gaining the confidence of their employers, Hansen says his coaching team are aware of the need to deliver another lift in the team's performances in 2014.
There continue to be areas of their work falling short of expectation. Somewhere near the top of the list is the breakdown, where the All Blacks were second best in all three of their Northern Hemisphere tests last year.
With England coming for a three-test series in June, Hansen sees the perfect opportunity to sharpen the team's work in that critical facet.
"Technically, there are things we have to address at the breakdown. We are not that far away but, because the game up there [in the Northern Hemisphere] is more combative than maybe Super Rugby, I think naturally there is a greater emphasis on the breakdown from them.
"The Irish game last year was another example where they really hoed into us. But some of that was about our mental attitude and our mental preparation to really go and take the game rather than expect the game to come to us. We have to have that mental attitude that we are going to take the game."