LOCK Luke Charteris believes Wales will reap the rewards of Liam Williams signing for European champions Saracens.

The 25-year-old will move to the Aviva Premiership from the Scarlets next season after rebuffing the offer of a national dual contract to stay in Llanelli.

The move is yet to be confirmed but Williams, who has a preference for full-back, has been signed by Sarries as a wing to replace Chris Ashton.

Former Newport Gwent Dragons captain Charteris moved from Rodney Parade in the summer of 2012 to Perpignan and after a spell with Racing 92 returned to the UK with Bath this season.

"For me, it was the best thing I did moving outside Wales, from a personal point of view, for family, I've loved the experience," said the 33-year-old, who is not captured by 'Gatland's Law' as there was no offer from a Welsh region on the table when he signed for Bath.

"From a rugby point of view, I feel I definitely feel I developed from being out there. There are certain boys who've moved and it hasn't worked for them, for whatever reason, and they've been much happier back home."

He backs Liam Williams to shine at Allianz Park for the English heavyweights and expects another Welsh player to fill his boots out west.

"I've spoken to 'Sanj' a fair bit about it and for him I think it's a great move. He'll be playing in an unbelievable team, in a great league in the Premiership next year, he'll flourish in it and go from strength to strength," said Charteris.

"I understand from Wales why they want to keep players here, but from a selfish or player's point of view I think it's undoubtedly the right move.

"Wales as a national team will benefit from that because he'll come back with more experience in Europe with Saracens, there'll be little things he can pick up from them.

"And there are only four teams in Wales, so it opens up another spot for someone else."

Charteris is reunited with Alun Wyn Jones in the home boilerhouse against South Africa this evening after sitting out the last-gasp win against Japan.

The Springboks have lost the services of talisman Eben Etzebeth but the former Dragons doesn't expect an easy ride from tourists' new combo.

"I think the strongest second row this season has been Pieter-Steph du Toit. He's been quality for the national side, I know he's been playing well for the Stormers as well. Lood de Jager is a very good player as well," he said.

"Franco Mostert on the bench is another good player. Second row and back row in South Africa are like conveyor belts."