Tyler Morgan has become the first uncapped player to sign a National Dual Contract with the Welsh Rugby Union.
The Newport Gwent Dragons centre's signature was confirmed on Friday, along with those of regional colleague Hallam Amos and Scarlets prop Rhodri Jones.
All three players are set to remain with their current regions under the agreements, which follow those given to national team captain Sam Warburton and Ospreys' Dan Lydiate.
"I am over the moon to sign a National Dual Contract," said Morgan. "I'm a local boy and I'm very happy at the Dragons, so I'm delighted to commit my future to them and to Welsh rugby.
"The contracts allow us to work closely with the national squad management and for me that was a big incentive. Being able to get that extra advice and guidance will really benefit me going forward."
Amos, who won his only cap to date against Tonga in 2013, added: "I'm really pleased to have been offered this opportunity and I fully intend to make the most of it."
Jones made his debut against the Barbarians in 2012 before featuring in all five of Wales' 2014 Six Nations fixtures, and echoed the comments made by Morgan and Amos.
"These contracts offer us stability and peace of mind as well as first-class resources to allow players to concentrate on playing," he remarked. "The Scarlets have played a huge part in my career so far and I hope I can reward theirs and the WRU's faith in me in the coming seasons."
The players formed part of a list of 12 players who had been offered the new deals, which are co-funded by the WRU and the regions, and Wales head coach Warren Gatland concluded: "This is another important step forward as some of our youngest prospects commit their futures to the game in Wales.
"The structure we have created means a player's development and welfare is monitored by the national squad management and this will help players realise their full potential."