Wales prop Paul James has emphasised the importance of discipline ahead of his team’s World Cup opening match against South Africa.

"We can't afford to give silly penalties away and that is something we have been working on in training," the 29-year-old said. "If we can match them up front it's going to help us give our backs the sort of ball which will allow them to play better rugby."

The Ospreys front-row also highlighted that the fitness levels of the Welsh squad was a key factor in challenging the defending world champions.

"I think we have completed the toughest pre-season fitness training I have ever been involved in during my career so far," he added. "The fitness levels are there for us now and all the hard work has brought us together as a group."

Wales take on South Africa in their opening Group D game on Sunday, September 11.