South Africa’s Damian de Allende and RG Snyman suffered burns from an exploding can of petrol along with Munster teammates Mike Haley and CJ Stander last weekend.
World Cup-winning duo De Allende and Snyman, who were last week named in the Springboks squad to face the British and Irish Lions next month, sustained burns to their legs, hands and face, the club said.
They will miss their respective training and rehab sessions this week and see a specialist, while Haley and Stander sustained burns to their hands but might return to training this week, with their availability for Friday's game to be reviewed.
De Allende tells SuperSport: “We were just sitting around the fire and one of the boys threw a bit of petrol over the fire... then the whole thing caught alight and exploded. We should be okay in a few weeks hopefully.”
The Boks are due to face the Lions in the first of the three Tests starting July 24.