Boro coach Steve Agnew told the Evening Gazette: "Rhys has done really well to push through to the full Welsh squad at this stage of his career.
"He's a positive lad and he is working hard to try to engineer a place for himself in the game.
"We've sent Rhys out on loan to Burnley this season and the feedback has been excellent.
"He's been a regular in their team and we've been able to monitor his progress through DVDs.
"He went out on loan because he needed to be playing every week and Burnley has been the perfect place for him."