The sides were set to meet at Twickenham on November 10 in 2018, with a lot on the line as the World Cup approaches.
"If England can win at home, it will be a huge help. If the All Blacks win again, it will only add to their myth and standing. England need to set sail for the Far East knowing they can beat everyone."
However, Greenwood suggested England might suffer fomr a hangover of sorts after the 2017 British and Irish Lions tour, wich could disrupt their quest for the top ranking in 2018.
"It has already caused issues for Saracens' players and they have made up the backbone of the England team during this period of improvement.
"I am worried there is a slip-up waiting to happen, and that it will open up the door for Ireland to win the Championship. They also have their Lions back. Why are they not suffering in the same way, and what can be done?"