And Gatland challenged Hartley to be able to walk the walk if he can talk the talk.
He said: "Some of what he said was responsible for Richie Rees being banned for a lengthy period, yet he wasn't prepared to step outside with Gareth Williams when he was invited to do so. So we'll see how he fronts up on February 4.
"England imploded a little bit against South Africa, and... I saw Hartley go to pieces [for Northampton] against Leicester
"He's always got a lot to say, hasn't he? Let's see what he has got to offer and how he fronts up against us."
While England have been impressive in the last seven months, Gatland has no fears when the bookies' favourites come to the Millennium Stadium.
And Gatland also declared England will revert back to a one-dimensional set-piece orientated game after the loss of their two most mobile forwards Courtney Lawes and Tom Croft.
"England have no choice but to take us on up front," Gatland added. "Their front row is not particularly mobile and they are limited without [injured forwards] Courtney Lawes and Tom Croft.
"The strength of their team will be scrum-time, a driving lineout and physicality.
"England played some great rugby against Australia in the autumn, but I think they then got a little bit of a surprise against South Africa because they were very physical against England up front.
"The last few years we've had a great record against England, nothing to fear, and we should be favourites at home."