Tom Prydie is to become Wales' youngest international after being named in the starting line-up for Saturday's RBS 6 Nations clash with Italy in Cardiff.
The Ospreys starlet, who is just 18 years and 27 days old, comes into the side on the right wing for Leigh Halfpenny, who drops out of the squad.
Elsewhere, Wales are boosted by the return to full fitness of Mike Phillips, Ryan Jones and Gethin Jenkins. Phillips reclaims the number nine jersey from Richie Rees, Jones returns to the back row at the expense of Gareth Delve while Jenkins takes over from Paul James at loose-head prop.
In the final change to the side which lost to Ireland in Dublin last weekend,
Sam Warburton gets the nod at openside flanker ahead of his Cardiff Blues colleague Martyn Williams.
Regarding the inclusion of Prydie, Wales boss Warren Gatland commented:
"Tom has been with us for the duration of the campaign. He was one of two youngsters - brought in alongside Kristian Phillips - who we wanted to have a look at and we've been impressed with him.
"We heard some good things about him from his region and from the coaches at under 18 level and he has lived up to that, as has Kristian as well.
"We are not sure if Leigh Halfpenny is going to be able to tour this summer (because of an injury which may require surgery) and we also need to look at our options for the future and find someone to push the incumbents for the World Cup. There are one or two players out at the Regions who will also be on the radar but this is a great opportunity for Tom.
"He is the fastest player in the squad, he can play at full back as well as on the wing and he is not afraid to tackle so we'll see how he goes."
Wales: L Byrne; T Prydie, J Hook, J Roberts, S Williams; S Jones, M Phillips; G Jenkins, M Rees, A Jones; B Davies, L Charteris; J Thomas, S Warburton, R Jones (capt)
Replacements: H Bennett, James, I Gough, G Delve, D Peel, A Bishop, T Shanklin.