The talismanic skipper, who missed a chunk of the year with a groin injury, was named in a strong Brave Blossoms side by Japan coach Jamie Joseph for Friday's Pool A clash in Tokyo.
The Port Elizabeth-born striker said he was happy with his current form and believed that the Golden Arrows fixture was about rectifying his side's errors.
Ronaldo, 34, has won the renowned France Football magazine trophy for the world’s best player five times – as many as Messi – but is eager for more as he moves into the twilight of his career.
Springbok coach Rassie Erasmus said the match was too close to call after the two sides were separated by no more than two points in their past four clashes.
A clean sheet for Mamelodi Sundowns will be enough to take them to their first MTN8 final in three seasons.
The team have been in Port Elizabeth since Sunday where they are preparing for the Test and a friendly match between the SA Select Women and Spain Invitational XV.
The Citizens have dropped two points against SuperSport United last weekend after 3-3 draw that saw Thabo Nodada bragging a brace and man of the match award.
Holders Liverpool began their defence of the Champions League trophy with a defeat against Napoli on Tuesday, while one missed spot-kick condemned Chelsea to defeat against Valencia and another came to Barcelona's rescue.
Both legs of the semifinal failed to produce a goal and three consecutive spot-kicks were blazed over the crossbar before Mogaila netted to give the hosts a 4-3 win on penalties.
South Africa coach Rassie Erasmus made just one change from the starting side that drew with New Zealand in July when he named his team for Saturday’s crunch Rugby World Cup clash with the world champions in Yokohama.
