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Newcastle Falcons winger Mateo Carreras has left the club with immediate effect to move to French club Bayonne.
The Argentina international, 24, had already agreed to join the Top 14 outfit for next season, but that move has now been brought forward.
Carreras, who has 17 caps for the Pumas, scored 16 tries in 39 appearances for the Falcons.
Newcastle are bottom of the Premiership, having lost all 12 games this season.