Scotland lock Richie Gray admits the chance to sign for French giants Toulouse was too good to turn down after agreeing a four-year deal with the former European champions.
The towering 6ft 9ins second-rower will leave Castres for their Top 14 rivals at the end of the season.
The former Glasgow forward said:
This was a very difficult decision to make, I have loved my time in Castres, the club and the supporters have made my time here very special and I will leave with very fond memories.
However the opportunity to play for one of Europe's most successful clubs, steeped in history, is an incredible one for me. When I met with the club they described their ambition and I felt this was the right move for me, to challenge myself in what is a very strong squad.
I still have seven months here at Castres, I will give everything I can to the club in hope of achieving top six and then who knows.
My goal for now is to leave Castres on the best possible note, I will give everything I can to the club, the players and the coaches.
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Wales international Luke Charteris will join Bath rugby from Racing 92 next season.
The gigantic second row, who towers above most players at 6 ft 9 in, will join the Aviva Premiership club ahead of the 2016/17 campaign.
Speaking to his future club's official website, Charteris - who also attracted a late bid from Cardiff Blues - said:
It is such an ambitious club, and that’s a great atmosphere to be joining. They put a lot of emphasis on player development, making sure that everyone is improving no matter how experienced they are, and that is a very exciting environment to be part of.
There is some incredible talent in the squad and I’m really looking forward to heading over and getting started.
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