Gavin Henson a doubt for Wales with Achilles injury ahead of South Africa Test

Henson reportedly missed a training session on Thursday afternoon and will have to prove his fitness at the team's final practice.

The centre has only played three games this season. On Tuesday, head coach Warren Gatland admitted that Henson's injury was a concern but felt he was still OK to play.

If Henson misses out, though, then Wales will almost certainly turn to Tom Shanklin to play alongside Jamie Roberts at centre.

Despite the doubts surrounding Henson, however, it has not stopped Martyn Williams talking about Wales pulling off a rare win over the Springboks.

Williams, the favourite to play openside for the Lions, believes victory over South Africa is the "next step" for Wales.

He said: "Last season, going into the Six Nations, there were no expectations, especially after being knocked out of the World Cup.

"People are looking now, not just for us to compete, but to go up a notch and take a big scalp. We have got to try to beat one of the three big southern hemisphere teams now so that we can take the next step.

"There is going to be a great atmosphere, and everyone is really excited about it. This will be a proper measure of where northern hemisphere rugby is."

Williams said they expected a "big physical challenge" from the Springboks.

"We are familiar with them, and we want to go out and prove we are better than we showed in the first Test there in the summer when we lost 43-17," he said.