Lewis will lead the Welsh delegation at a showdown meeting in Heathrow Airport on Friday at which the whole future of the professional club game in three Celtic nations will be on the line.
When the countries last met in May it ended in acrimony with the Scots and Irish throwing Wales out of the tournament and agreeing to play among themselves next season. They were unhappy at the way Wales had successfully negotiated a deal with the RFU to take part in an Anglo-Welsh Cup competition over the next four years.
The argument from the Scots and Irish was that Wales had not been "open and honest" with them about their dealings with England, that by taking part in the tournament Wales were undermining the integrity of the Celtic League and that the five dates required simply could not be fitted into the calendar.
But in a "clear-the-air" memo to the Scottish and Irish Unions, as well as the Celtic League broadcast partners, Lewis has moved to set the record straight on a number of those issues ahead of Friday's meeting. And the WRU Chief Executive remains convinced there is enough flexibility within the season to ensure that the Welsh regions neither compromise the integrity of the Celtic League, nor put unfair pressure on their rivals through fixture compensation.
"The first principle is that the WRU and its four regions are totally committed to the Celtic League. It is our bread and butter, our main ranking tournament for European competition," said Lewis. "Ever since the WRU moved to bring the Scottish teams into the Welsh/Scottish League, and then backed the addition of the Irish to make it a proper Celtic League, we have given our utmost support to the tournament.
"We believe that the format of the last two seasons, where there are 20 fixtures on a home and away basis, is near perfect to meet the needs of everyone in the three nations.
"However, in the early part of this year we were faced with the prospect of being dragged into a 'Rainbow Cup' involving South African provinces, and then excluded from meetings that tried to get four Italian teams into a re-shaped Celtic League played on a home or away basis.
"Against such a background of uncertainty we had to find ways of increasing and improving the fixture lists for our regions - for the good of their players and their fans. That's why, having initially rejected an offer from the RFU and their Premier Division clubs, to play in an Anglo-Welsh Cup we were forced to re-open negotiations with them.
"What has come out of those negotiations is a four-year deal to play in a cross-border cup competition with England's top dozen clubs that will require five weekends in the season - three for Pool matches and two for semi-finals and a final.
"The Scots and the Irish say they cannot find a way to accommodate those five weekends. We will be presenting them with further plans that should allow them to find a solution.
"We simply have to find a way through this or we are all going to suffer. Our broadcasters will leave us, sponsors will walk away and the fans simply won't have the same level of rugby to watch.
"We believe we have found more than one way for the Celtic league season to support our plan to play in the Anglo-Welsh Cup. If the Scots and Irish turn down those plans then they will simply be cutting their own throats along with ours."
British and Irish Lions captain Sam Warburton is looking forward to bringing together players from Ireland, Scotland, England and Wales for the biggest challenge of their careers - a series against world champions, New Zealand.
For the fifth year running, Wales referee Nigel Owens will be in charge of proceedings at Judgement Day V at Principality Stadium. It promises to be 'extra special' for the Wales' favourite ref, as he will be making his 150th appearance in the league.
There will be no shortage of inside knowledge from Bowl Finalists Caerphilly and Amman United when they face each other on Sunday at National Finals Day. Caerphilly hooker Rhys Cleverly knows the Principality Stadium pitch better than most as a matchday groundsman, while Amman United can look to Wales' record try scorer Shane Williams for some helpful advice.
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The countdown is on for Judgement Day V as tickets for the big day at Principality Stadium soar through the 50,000 mark. Players and coaches alike are bursting at the seams to play in the double header with Dragons coach Kingsley Jones claiming there is a 'real buzz' about the event.
WRU TV went behind the scenes when the four regions got together to test their skill set for the BBC's Scrum V Live rugby show, at the WRU National Centre of Excellene in the build up to Judgement Day V. Blues' Matthew Morgan was one of the stars of the show while the Dragons' Cory Hill proved a surprise package...the full set of results will be revealed on tv screens on matchday
Wales assistant coach Richie Pugh is confident his side can cause a few headaches in the Hong Kong Sevens this weekend. In a tough group, Wales kick off their campaign against New Zealand on Friday before playing Japan and Fiji, who are chasing their third consecutive Hong Kong title, on Saturday.
Bedwas had to overcome a stubborn Carmarthen Quins side before winning the Foster's Challenge Cup final in Bridgend with a 23-18 victory. Bedwas captain Nicky Griffiths pays tribute to his side who have claimed the club's first piece of silverware in the modern era.
Team coach Brett Davey is aiming to keep his unbeaten run in cup finals at Principality Stadium intact when his side take on Amman United in the WRU Bowl final, after he guided Caerphilly to a 20-14 win against Cilfynydd in the semi-finals.
Penallta are hoping to go one step further than last season when falling to Bedlinog in the WRU Plate Final. After a titanic struggle against Nant Conwy, they have given themselves a great chance, after a hard fought 18-13 semi-final victory.
The unique jeopardy of Judgement Day V has been described by stars from Cardiff Blues, Ospreys, Scarlets and Newport Gwent Dragons who will face each other in the annual double-header at Principality Stadium on 15th April.
School club hub officers in schools throughout Wales are enriching lives by helping pupils to engage more with their education, their community and improve their own outlook on life and future prospects by improving confidence and developing skills such as leadership.