Date: Saturday, 14 February Kick-off: 1730 GMTVenue: Millennium Stadium Coverage: Live on BBC ONE, full commentary on BBC Radio 5 Live, BBC Radio Wales, BBC Radio Cymru and the BBC Sport website
Wales trained under the closed roof during snow before their Scotland encounter
England manager Martin Johnson says he wants the Millennium Stadium roof left open for Saturday's RBS Six Nations clash with Wales in Cardiff.
Both teams have to agree for the retractable roof to be shut for a competitive game.
"It's an outdoor game," Johnson said. "Unless there's extreme weather conditions that are really going to affect the surface it should be open.
"Both teams have to agree to have it shut, that's my understanding."
No rain is forecast for Saturday, although the roof does help magnify the big-game atmosphere when closed.
Italy coach Nick Mallett also refused to have the roof closed for their match in Cardiff in last season's Six Nations, although the end result was a record 47-8 Six Nations victory for Wales over the Azzurri.
England's Johnson backs line-out
"I've played indoors a couple of times, I think it's just better [for stadia to be open to the elements], it was intended to be an outdoor sport," Johnson added.
"We're pretty relaxed about it, I don't think it's going to win or lose anyone the game but I think the weather's supposed to be pretty good tomorrow so let's get it open and get it on."
Wales assistant coach Rob Howley claimed the hosts are unconcerned over whether the roof would be open or closed.
He said: "If it's open or closed it's a Test arena. It's open so we just get on with it.
"I suppose recently we have played with it closed, it sweats a lot. It's very wet and I don't know what the forecast is - apparently it's cloudy weather.
"And if it rains, it rains. I think that we have to be comfortable in whatever environment we play in and certainly the players are used to whatever the conditions will be."
Johnson denied his stance was anything to do with "mind games" between the coaches and laughed off hints by opposite number Warren Gatland that Wales had cracked their line-out calls.
"Can he come and tell some of our guys what they are?" Johnson joked.
"We're confident in our line-out, we'll be fine. These things are changeable, if you had them why would you say, who knows, is it a bluff?
"We're concentrating on ourselves, the position we're in, we just need to improve as a team. We've got a lot of improvement in us."
Wales suffered a blow on Friday when their record Test try-scorer Shane Williams was ruled out with the ankle injury he suffered in last week's win in Scotland.
Scarlets wing Mark Jones replaces Williams in the number 11 shirt, although there was better news on number eight Andy Powell who has overcome his calf problem.
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