South Africa's former scrum-half Joost van der Westhuize will lead the Springboks out for Saturday's Test against New Zealand.
The 43-year-old was diagnosed with motor neurone disease in 2011, and set up his J9 Foundation for fellow sufferers.
"I realise every day could be my last," Joost told BBC Sport in 2013.
"It's been a rollercoaster from day one and I know I'm on a deathbed from now on.
"I've had my highs and I have had my lows, but no more. I'm a firm believer that there's a bigger purpose in my life and I am very positive, very happy."
The Test, between the top two sides in the world, kicks off at Ellis Park at 4.05pm today.
Van der Westhuizen won 89 caps for South Africa between 1993 and 2003.