England assistant coach Andy Farrell texted BBC Wales pundit Jonathan Davies to thank him over his prediction Wales would "smash" England.
Davies insisted there will only be one winner between Triple Crown-chasing Wales and an inexperienced England team in Saturday's Six Nations match at Twickenham.
But Farrell claimed Davies helped him write his team talk.
"I sent a text to thank him. I said it was brilliant news," said Farrell.
"People are calling us underdogs and it adds spice to the game."
Davies, who said on BBC Wales' Scrum V programme that Wales "should absolutely smash" England physically, was a former Great Britain rugby league team-mate of Farrell's.
"Everybody is a competitive beast. Of course pride comes into it," said Farrell whose son, Owen, will start at fly-half against Wales.
"Everybody wants to prove people wrong. There is a sense of excitement that we can and that is a big motivation for us going into the game.
"You can tell there is something different in the air as far as training is concerned. The guys are revving up for a big weekend.
"Wales have been playing very well of late. They are a good side and it will be a challenge for us - a new side coming home for the first time in the Six Nations.
"But we have been pretty good at meeting challenges head on so far."
England may be unbeaten in this campaign, but they were made to work hard for away wins against Scotland and Italy, with their only tries coming courtesy of two charge-downs from the now injured Charlie Hodgson.
Wales are more familiar with the surroundings than England, with hooker Ken Owens the only member of their starting XV not to have appeared in a Test match at Twickenham.
England have six players making their first international appearances at the stadium in the most inexperienced red rose team to play a championship match for 23 years.
England's tally of 182 caps in their reshuffled starting XV is dwarfed by Wales' total of 488 and is fewer even than the visitors boast on the bench.
Wales, who reached the World Cup semi-finals last October, have been far more potent in attack, playing with pace, tempo and continuity in their wins against Ireland and Scotland.