Aled Brew has joined the exodus of players out of Rodney Parade after it was reported he will leave Newport Gwent Dragons for Biarritz.
The Welsh region had hoped that the Wales wing, 25, would sign a new deal when his current contract expires at the end of the season.
But Brew has opted to head to France, having also been linked with Perpignan.
Brew has been overlooked for Wales' Six Nations squad but won his eighth cap in his sole appearance at the World Cup.
The presence of Shane Williams and the emergence of George North, Leigh Halfpenny and Alex Cuthbert has restricted his opportunities in the Wales jersey.
Brew's decision to sign a two-year deal with Biarritz comes within a week of fly-half
confirming he was leaving the Dragons at the end of the season to join Cardiff Blues.
The Newport-based region will also be losing
in June, with the Wales lock heavily linked with a move to Perpignan.
Charteris' move to the Catalan club is expected to be unaffected by the coaching shake-up at the club, which follows the sacking of Jacques Delmas as coach in November.
Delmas, who took over in July, paid the price for a poor start to the season that saw Perpignan languishing in ninth place in France's Top 14 Championship after 10 games.
Defeat to the
Dragons in the Amlin Challenge Cup
was deemed to be the final straw.
Marc Delpoux, current coach of Bordeaux-Begles and a former Perpignan captain, will take over at the end of the season.