Wales are preparing for matches against Argentina, Samoa, New Zealand and Australia without Adam Jones, as he recovers from a knee injury.
Aaron Jarvis, Scott Andrews and Samson Lee are all hoping to be given an opportunity against the Pumas on 10 November, although Wales coach Rob Howley has the option of switching Gethin Jenkins or Paul James across the scrum.
Rees said: "We have props who can play both sides of the scrum, with Paul James and Gethin Jenkins both able to move over, and it will be up to the coaches when it comes to selection.
"But I can certainly see one of these youngsters coming through and getting to the next level over the next three or four weeks.
"Adam is a loss, but we have got three pretty good players there waiting in the wings at the moment, and the challenge for them now is to kick on and impress the coaches and take their chance when it comes.
"The only thing they may lack is experience at international level, but there is no better place for them to get that than in this November series when you look at the fixture list."
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.