Wales back Liam Williams' supposed move to Saracens could cause problems for the national team, according to skills coach Neil Jenkins.
It was reported on Tuesday that the Scarlets full-back had signed a two-year deal at Allianz Park, making him subject to 'Gatland's Law', which restricts the use of players plying their trade outside Wales.
The loss of Williams, who is thought to have turned down a national dual contract, could free up funds to lure Leigh Halfpenny - thought to be wanted by all four of the Welsh regions - back to the country from Toulon.
However, if Halfpenny was to stay in France or sign for another club outside Wales, he would join Williams, Taulupe Faletau, Rhys Priestland, Jamie Roberts and George North in competing for four places set aside for exiles in the national squad.
The number of available places stands at three this season and is set to reduce to two in 2019 after rising to four from 2017.
"That is the first I have heard of it," Jenkins said of Williams' reported transfer. "We have always said we want to keep our best players in Wales and Liam is one of those.
"We want to keep Liam and we would love to have Leigh back.
"If Leigh stays in France and Liam goes it does become an issue, but it's an opportunity for others.
"If it does happen we will make a decision then."
Saracens are the defending English and European champions and sit top of the Premiership table.