Scotland flanker Hamish Watson has signed for French club Castres after departing Edinburgh, according to reports. The move follows an injury to Castres player Napoléone Papali’i, with the club seeking cover in the flanker position. Watson’s signing is framed as a direct response to the need for additional squad options while Castres manages the impact of Papali’i’s injury. The reports agree that Watson is a Scotland international and that he is leaving his previous club, Edinburgh, to join Castres. Beyond the general circumstances of Papali’i’s injury and Watson’s transfer, the sources provide limited additional detail on contract length or specific timelines. Overall, the information presented focuses on the personnel change at Castres and Watson’s transition from Edinburgh to the Top 14 side.