Argentina host Australia on October 8 when the tournament comes to Europe for the first time in a replay of last year’s World Cup semi-final.
And former England centre Greenwood predicts that two attacking teams will light up London in front of a cosmopolitan audience of British and ex-pat supporters.
“Argentina never fail to bring colour, enthusiasm and passion to the game and both sets of supporters will do that in the stadium, whether they’re in gold and green or the terrific Pumas fans,” said Greenwood.
“Both compete in The Rugby Championship where they don’t dominate physically. Look at the players in the backs – [Nicolas] Sanchez, Imhoff, [Juan Martin] Hernandez are all quite slight and so are most of the Australians like [Bernard] Foley, [Matt] Giteau and the rest.
“They both play a really entertaining brand – they try to go around you, to pick the lock rather than batter the door down.
“We’ve had a cracking example of that at the World Cup. England were out and there was some trepidation about what the knock-out stages would be like. But we got great games. This Argentina v Australia one has got 35-30 epic written all over it.”
Australia have brought European-based players like Giteau, Adam Ashley-Cooper, Drew Mitchell and Will Genia back into their training squad this summer.
But Greenwood highlights Argentina’s Juan Imhoff as global superstar after the wing’s try-scoring displays for the Pumas and Racing Metro.
“I’ve had Imhoff in my world team for the last two or three years,” said Sky Sports analyst Greenwood.
“I thought at the World Cup he was better than [New Zealand’s] Julian Savea – plus he’s added scrum half to his talents after playing there for an hour in the Top 14 final.
“I like to maintain the Corinthian spirit and he’s a wonderful character, an outstanding young man who’s always happy to say hello, smile and chat about the game.”
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