Cardiff Blues wing Owen Lane has been called into Wales's World Cup squad as replacement for injured back-row forward Josh Navidi.
The 21-year-old made his Test debut during Wales's World Cup warm-up games, scoring a try against Ireland in Cardiff.
The Welsh Rugby Union confirmed that Lane is on his way to Japan, with Navidi sidelined for the remainder of the tournament due to a hamstring injury. Lane will arrive in Tokyo later on Tuesday.
Wales face semi-final opponents South Africa in Yokohama on Sunday.
Shaun Edwards has likened South Africa dangerman Cheslin Kolbe to England World Cup winner and try machine Jason Robinson.
The 5ft 7in Springboks wing presents a huge threat to Wales in Sunday's World Cup semi-final clash.
He has scored seven tries in 13 Tests and added an extra attacking dimension to South Africa's established physical approach.
"If you want to watch a game of rugby, you want to go and watch Cheslin Kolbe," Wales defence coach Edwards said.
"We will have to keep an eye on him. He is one of the most dynamic players I've ever seen.
"I was lucky enough to play with Jason Robinson for many years. I was his captain at Wigan when he first came in the team there."
"Kolbe is a similar player to Jason - incredibly explosive, short and defies the fact that you have to be big to play the game of rugby."