Watson – the 28 times capped openside flanker – sustained a knee injury in the national team’s opening Pool A defeat to Ireland at the International Stadium Yokohama yesterday, with a post-match scan confirming he’ll play no further part in the tournament.

Bradbury – who was in Japan as precautionary injury cover – will take the place of his Edinburgh teammate in the 31-man group.

Scotland Head Coach, Gregor Townsend, said: “While there is a high probability of picking up injuries during a Rugby World Cup, it is always disappointing to see someone having to head home.

“We feel for Hamish, who had worked so hard for this opportunity, and wish him well in his recovery.”