Wales coach Steve Hansen has invited Cardiff-based Campbell to join the team's training squad as they prepare for the November internationals.

Campbell has jumped at the chance to help out, and the Sydney Olympics 200m silver medallist hopes to become a full-time member of the coaching team.

"My ambition is to become a coach with them and I would love to go to Australia with the team for the World Cup next summer," said the 29-year-old.

"The main aim is to improve the speed and fitness of the players and hopefully that will be to the benefit of the side."

Hansen has already brought in Andrew Hoare as a fitness coach and Scott Johnson as skills coach to help him turn Wales' fortunes around.

Campbell admitted he thought the invitation was a joke at first: "But the more I thought about it the more I realised it was a good idea."

He added: "At first the players were treating it as a bit of a laugh, but by the end of the week everyone was taking it very seriously.

"The players are different shapes and sizes, which is a challenge in itself.

"Some of the boys have got genuine pace. There's a pre-conception that rugby players aren't the quickest - but that's not true."