Scotland head coach Gregor Townsend admits the national side could suffer if players continue to move abroad.
Finn Russell has announced his decision to leave Glasgow at the end of the season, with Racing 92 the expected destination for the fly-half.
Russell will join Greig Laidlaw and Richie Gray in France, while players such as Sean Maitland and John Barclay play elsewhere in the United Kingdom -- though Barclay is set to move back to Edinburgh.
There have long been difficulties with securing the release of players in France in time to join up with their international sides, and Townsend is keen to keep as many players playing in Scotland as possible.
"The better thing for the national team is more people playing in Scotland," he said.
"If more and more players leave Scotland, it will be much tougher. A huge reason Ireland have been successful is their players are in the same area, playing in Ireland and building up combinations and connections.
"Obviously we wish Finn all the best. We have two players currently injured in France who were likely to be in our squad -- in Richie and Greig -- and we'll now have a third but you've got to make sure there's not too many players leaving Scotland."
Townsend is preparing his side to take on Australia this weekend after suffering a narrow defeat to New Zealand on Saturday. The Dark Blues almost snatched a dramatic win in the final seconds before going down 22-17.
Despite a hugely impressive performance, Townsend has demanded more from his players after making four changes, with Ryan Wilson, Maitland, Grant Gilchrist and Simon Berghan included in the starting XV.
He said: "We play the current number three team in the world, and arguably the best attacking team in the world.
"Australia beat New Zealand a few weeks ago, were very good against Wales and for a lot of the game on a wet day against England, so we know we're playing one of the form teams in the world right now.