Brummer answers Bulls SOS
Johnny Kotze and John Jackson, the next players in line to replace Swanepoel, are also out injured - hence the SOS to Brummer.
Junior Springbok Franco Naude is now the next player short-listed.
The Bulls already had to send John-Roy Jenkinson home because of a hamstring injury, with Conrad van Vuuren replacing him.
Hanro Liebenberg, who picked up a pectoral muscle injury, will remain with the team.