Wales interim boss Rob Howley has revealed that the absence of Mike Phillips in Spala partly cost him a starting spot against Argentina.
Phillips, James Hook, Gethin Jenkins and Luke Charteris are all based in France and Howley has hinted that scrum-half Tavis Knoyle's impressive showing at the Wales training camp in Spala gave him the edge ahead of Phillips for the number nine shirt.
The Bayonne scrum-half has had to settle for a spot on the bench alongside Perpignan star James Hook.
"We've explained the benefits of playing in Wales," said Howley.
"Preparation for rugby is so important these days. One of the advantages of the participation agreement with the regions is the Welsh-based players are able to take part in our 13-day preparation period, which is critical for the team's chances of success.
"Tavis (Knoyle) has been available and he got through a lot of work last week in Poland.
"It was important for us that we had good preparation and, as a half-back, Tavis has been an integral part of the team.
"He has worked his socks off, deserves to start and has a great opportunity on Saturday."
"There is the issue of being in and around the team," continued Howley.
"The dynamics of the team are important when you spend time together because they contribute to the marginal gains.
"When you go to England or France to play your rugby, you take yourself out of that environment.
"It's a difficult one because some of those players who have gone are experienced and so we might lose that.
"But I suppose we have to take the hit because we want the best players to be in Wales."
One French-based player who will start though is Gethin Jenkins. The Toulon prop comes straight into the side at loosehead prop, an area where Howley admits Jenkins is world-class and Wales lack the same quality in depth as other positions.
"Gethin has come into the mix because he's available for the Australia game," stated Howley.
"He and (Luke) Charteris have been able to discuss and negotiate over their contracts and their availability to play for Wales.
"It's pretty important when you go abroad that you are responsible enough to make sure people know you want to play for Wales.
"At loose-head prop we have Gethin, world-class player that he is and with his experience.
"But in some positions we haven't got the strength in depth across the board.
"I would like to think we had."