The Northampton centre was due to play in Friday’s ‘A’ match with the United States but was promoted to the seniors after Evans failed to recover from a shoulder injury suffered in last weeks’ 49-3 hammering by New Zealand.

Ansbro, 25, will become the first black player to represent Scotland as head coach Andy Robinson rings the changes for their second autumn international.

Scrum-half Rory Lawson is awarded the captain’s armband while Scott McLeod replaces Jim Hamilton in the second row.

Nathan Hines starts at flanker as Kelly Brown shifts to No 8 with Richie Vernon dropping out, and Rory Lamont replaced on the wing by Nikki Walker.

Dougie Hall and Moray Low will line-up on the bench alongside Chris Paterson, who is included for the first time since his kidney injury against Wales on his 100th cap in February.

The Springboks arrive at Murrayfield off the back of narrow victories against Ireland and Wales, and Ansbro is aware he takes a step into the unknown when he stands toe-to-toe with the world champions.

"It's the highlight of my rugby career so far to be called up for a game of this magnitude to represent Scotland," he said.

"It is going to be like nothing else I've experienced in rugby - and nothing can prepare you for that so you have to stay focused and confident.

"It is the proudest moment of my rugby career and with the right performance it can be a lot more than that too.

"South Africa are a fantastic side, a physical side, the world champions.

“This is why you play rugby, to perform in this type of match in front of our own crowd