Sun Met-winning horse trainer Eric Sands was violently attacked and robbed at the Milnerton Training Centre on Tuesday.
Sands, who is 62 years old, was attacked while in the yard of his stables, by an intruder brandishing an axe.
Three more assailants, armed with knives, joined in the ambush and tied him up in his office.
Reports say there was a security guard on duty when the attack took place, but they did not hear anything.
Horse racing and betting operator Phumelela Gaming condemned the attack.
“Unfortunately, we live in a country where crime has seemingly become part of everyday life and we are not immune against it,” the betting operator said.
“We are all shocked at the events of last week Wednesday and I want to assure Eric that he can count on everyone at Phumelela for support during this traumatic time.”
Phumelela said it would assist in any way to make sure the perpetrators are brought to book.