Scotland lock Richie Gray will leave Castres for Top 14 rivals Toulouse at the end of the season.
Bath have agreed a deal to sign Scotland international David Denton from Edinburgh, subject to a medical.
Scotland back-row Alasdair Strokosch has announced his retirement from international rugby.
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World Rugby chief executive Brett Gosper has defended the governing body's handling of Craig Joubert's penalty call.
Glasgow Warriors and Scotland scrum-half Henry Pyrgos has been ruled out for four months after undergoing wrist surgery.
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