Charteris will fly back from holiday to join the touring party

Wales have summoned Dragons lock Luke Charteris to their South Africa tour squad to replace Bradley Davis, who has an ankle ligament injury.

Charteris is expected to fly back from a holiday in America via the UK to catch another flight to South Africa.

Davies, who was not involved in the 22 for Saturday's first Test, has left the camp after being injured in training.

"Luke's been involved with the squad before, we're confident he'll fit in," said assistant coach Robin McBryde.

"This is a great chance for him to impress us and we are looking forward to seeing him arrive in South Africa.

"Bradley has already proved to us that he is one for the future and I know he has benefited enormously from his time here with the squad.

"Bradley has had a chance to test himself in the environment we are creating and he is aware of the intensity and focus we are looking for."

Meanwhile head coach Warren Gatland admits the nerves are starting to show amongst his players and staff ahead of Saturday's opening Test in Bloemfontein.

Gatland said his Grand Slam winners had shown signs of tension in training on Tuesday.

"There was definitely a bit of edge around," Gatland said.

"There were a few more nerves and twitches not just amongst the players but amongst the coaches as well. That's nice when you start getting that."

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"We're really excited about Saturday and it's a great honour for us to be here and playing against the world champions," Gatland said. "But you've got to be up for it and excited about it."

Despite all the mixed messages emerging from the South African camp about their planned tactics, Gatland insists none of it has changed his plans about the way Wales will approach the game.

"We know how we're going to play," he said. "What will be interesting is seeing how they play against us.

"I'm looking forward to the fact that they want to run us off our feet, they want to play an off-loading game and physically dominate and intimidate us - I'm looking forward to those challenges.

"That's one of the big fears that we've got - how big and physical and fit these South African players are.

"And playing under Super 14 and those conditions, if they do keep the ball on the park and runs us and try and put us under pressure then we're going to find it very difficult.

"But if we're able to live with them then we'll have achieved a lot."