James Hook has admitted he could miss Wales' Six Nations training camp in Poland as it clashes with Perpignan's Top 14 showdown with Brive.
Hook's Wales team-mates Mike Phillips and Lee Byrne also play in France but both have been cleared for part of Wales' visit to the Spala ice chambers.
International Rugby Board rules state that clubs must release international stars a week before the Six Nations.
Wales visit Ireland in their Six Nations opener in Dublin on 5 February.
But Wales' special 'participation agreement' with its four regions ensure their Wales-based Test players are released two weeks ahead of the tournament to prepare with coach Warren Gatland.
Fly-half Hook, who also played at full-back for Wales at the World Cup, is unsure if he will receive clearance from his club to join Wales' get-together because Perpignan visit Brive on 26 January.
"Ultimately I'm out here and have a job to do," said the 26-year-old.
"I love the club I'm with now and don't want to upset the apple cart here.
"There is a release for the French clubs only one week before the Six Nations and Warren wants two weeks.
"It is difficult but all I can do is to express my ambitions to play for Wales and if they want me I'm available.
"Hopefully I'll be available two weeks before but definitely one week before.
"Perpignan have a big game against Brive the week before the first Six Nations game so it is up to the club.
"If the club want me here I'll have to play and I'll put 100% into that."
Wales begin their Polish training camp on 22 January but for the first three days providing he is back in France for Bayonne's Top 14 match against Toulon on 26 January.
Clermont Auvergne have also agreed to let full-back Byrne attend between 23 and 25 January as long as he returns for their trip to Bordeaux-Begles on 26 January.