Josh Lewsey - "the Welshman who got away" - says regional rugby is working in Wales.
The England and London Wasps fullback - whose mother is a Welsh speaker and was born in Cwmllynfell - was on the receiving end of last Sunday's Heineken Cup loss to the Celtic Warriors, and says the new-look regional system should get the credit.
"Welsh rugby has been through a torrid time recently," Lewsey said in a newspaper column.
"Some doubters questioned it at the time, but the positive performances of their national team in the World Cup, aligned with the competitive nature of Celtic Warriors, Llanelli Scarlets and The Dragons, clearly vindicates the changes.
"It's an unfortunate situation but a brave necessity in order to maintain the existence of the professional game."
Lewsey added: "Whole communities in Wales, along with the game in general, need Welsh rugby to be strong and it seems after a few fallow years that it certainly is where it's going.
"Yet from my point of view they can continue this renaissance once our game against Celtic Warriors finishes."
The return game in Pool Six takes place at the Brewery Field on Friday and Lewsey is looking forward to playing in front of a sellout 10,000-strong crowd.
"The result at the Causeway Stadium will make the re-match on Friday night mouth-watering prospect," Lewsey said. "Pool Six is the tightest of all, with three teams level top with 10points. Consequently, the next two away games are simply must-wins for us to progress."
As the countdown continues for RWC2015, Tournament Chief Executive Debbie Jevans visited the Millennium Stadium to discuss preparations for the eight matches and reveal the positive news that 100,000 tickets for games at the home of Welsh rugby have sold in the last seven days.
Jason Harries is targeting a first win on the World Series circuit this season with Wales. The series returns to action this weekend in Dubai where Harries is part of a team hoping to build from its efforts in round one in October.
Wales skipper Jevon Groves says his side have addressed a few points from Gold Coast and aim to 'hit the ground running' in the next two rounds of the World Series, kicking off with this weekend in Dubai before heading off to South Africa next week.
Wales Sevens manager Steff Thomas is hopeful his side can build from a quarter-final spot in the opening round of the World Series in Australia when his side take part in the forthcoming double header in Dubai and South Africa.