Jamie Roberts' impressive displays could earn him a Lions tour call
Jamie Roberts insists Wales' lacklustre final 20 minute display in their opening RBS Six Nations win in Scotland could be a blessing in disguise.
The Wales centre believes the manner in which they "switched off" will ensure there will no complacency when the Welsh host England on Saturday.
"We switched off half way through the second-half and we can't afford to do that against England," said Roberts.
"It may be a good thing, it is something we need to address."
Welsh coach Warren Gatland praised Roberts' display in Wales' 26-13 win at Murrayfield, saying Scotland "could not handle" the 22-year-old Cardiff Blues inside centre.
Roberts won the RBS man-of-the-match honour in his eighth cap and he has told his Wales team-mates they must maintain their standards of the first hour if they are to beat England
Wales are bidding for a hat-trick of Six Nations victories against their biggest rivals and neighbours in Cardiff.
And the reigning Grand Slam winners and defending Six Nations champions are "confident" after beating the Scots four tries-to-one in Edinburgh.
Tom Shanklin, Alun Wyn Jones, Leigh Halfpenny and Shane Williams all crossed to give the visitors a 26-6 lead after an hour.
It was a bit of an anti-climax in the changing room at the end of the game, if felt as if we've lost due to the way we finished the game.
Scotland replacement Max Evans scored a consolation try in a "disappointing" final quarter for Wales.
"We know the standard we set as we played some fantastic rugby at times," said Roberts.
"We didn't perform too well in the second half.
"There are are things we need to address in training, particularly but we were good in defence, although we were disappointed to concede a try."
Experienced Welsh second row Ian Gough had never won at Murrayfield but was part of Wales' instrumental front five that gave Gatland's men the platform in their victory this year.
"I was up here two years ago when we lost," remembered the Ospreys lock.
"And in the airport on the way home, the fans wouldn't even look at us - so winning was great.
"But it was a bit of an anti-climax in the changing room at the end of the game, if felt as if we've lost due to the way we finished the game.
"It was pretty frustrating that we didn't maintain our momentum of the first hour all of the way through the game.
"We should have scored a few more tries and we missed a few kicks, so we were disappointed that it wasn't a 30 or 40 point victory as we deserved it by the way we played."
Wales captain Ryan Jones and centre Gavin Henson were named in Gatland's original team to face Scotland but both withdrew due to calf injuries.
Gatland will delay naming his Wales team to face England at The Millennium Stadium until Thursday to allow both star men enough time to recover from their problems.
Try-scorer Williams was replaced in the 72nd minute at Murrayfield with an ankle sprain but the Welsh management team are not overly concerned about the International Rugby Board Player of the Year.
"He's okay," insisted Gatland.