Rhys Webb has placed his Wales future in doubt after agreeing to join Toulon when his national dual contract expires next summer.
The Welsh Rugby Union and Ospreys have announced the British and Irish Lions scrum-half's decision to move overseas for an undisclosed fee after signing a three-year contract.
The move could affect his international future with the so called 'Gatland's Law' allowing only four players at clubs outside of Wales to play for the national team.
The quota will drop to two wildcard picks for the 2019-20 season.
Webb's Ospreys team-mate Dan Biggar will also leave the club to join Northampton next season.