Wales winger Shane Williams has agreed to play rugby in Japan for Tokyo's Mitsubishi Dynaboars on a deal that is believed to be worth £600 000.00.

Wales' record try scorer Williams says that the offer came after the Barbarians match and was "too good to turn down".

Williams has also revealed that he will take his wife Gail and his young children, daughter Georgie and son Carter with him to Japan for the experience.

The former Ospreys winger has played a series of farewell games since he retired from International rugby and scored a try at the death in two out of three of the matches.

The Barbarians match against Wales was planned to be his last but a deal said to be worth £600k has tempted him out of retirement

"At first I said no, it came as a real surprise and the offer only came shortly before the Barbarians match," Williams told Wales Online.

"But then when I sat down with my wife to discuss it we realised what a great opportunity it would be.

"So we're all going and I'm excited. I have spoken to players who know what it is like out there, the likes of Mils Muliaina, Jerry Collins and George Smith, and they all said the life experience is fantastic.

"That helped persuade me to give it a go. It's a bit of a step into the unknown, but one hell of a challenge."

Williams said that the offer came "totally out of the blue" so he will travel to Japan on Saturday to meet his new employers and to find potential places to live.

Williams was expected to help the Ospreys with some coaching duties but now his new playing season starts in August after which he will return to Wales - unless of course another surprise offer comes out.

"The Ospreys have given me their blessing and I'm grateful to them for that," added the former world player of the year.

"I never thought I would get the chance to go and play somewhere like Japan and I really feel this has to be grabbed while it is there.

"It's been an incredible season for me, finishing with Wales and then ending the season on such a high with the Ospreys by winning the RaboDirect title, and I really thought the Barbarians game would be my very last.

"But sometimes life has surprises and that's what this was. I was all ready to hang my boots up.

"To be honest it is a little bit daunting.

"But I'm going to go out there and try to throw myself into it and I hope we can all settle as a family.

"It's a new culture and it is obviously going to take a bit of getting used to for someone like me who has always valued his roots so much.

"But it's not forever and I'll be coming back to Wales."

The Dynaboars relegated from Japan's top level of rugby but hope that players like Williams will help them to be promoted from Division Two at the end of the season.