Gray is a Toulouse player
Toulouse, who won their last Top 14 title in 2012, also confirmed talks are underway with Samoan international Paul Perez as cover for winger Yohann Huget, who seriously injured his knee in France's World Cup opener against Italy.
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Perez, 29, is currently on World Cup duty with Samoa, and could join the French club after his country's final match against Scotland on Saturday along with compatriots Census Johnston and Iosefa Tekori, who also play in Toulouse.
Perez played in his country's first three World Cup matches and scored a try in a 5-26 defeat to Japan.
Agence France-Presse