The Springboks – who beat France by 29-28 in a thrilling contest in Paris – will face England in the last four on Saturday, while Argentina and New Zealand will meet in the first semi-final on Friday.
“We worked together as a team and we talked a lot about never giving up. We knew it would take something special and we did it today,” said Kolisi.
“France asked a lot of questions of us, but the character we showed stood out. We had a clear plan on what we needed to do, especially at the breakdown, and we had to fight for one another, especially in the last eight minutes of the yellow card. I’m proud of the guys and the discipline they showed.”
Nienaber was equally proud of the team: “We knew how tough it would be to come to France and face the French. They’ve been playing well and were consistent in their performances.
“They’ve also been building well as a team, so we knew it was going to be a proper Test match and it was always going to be tight. Many of the games (in the tournament) have been won and lost in the last eight minutes.”
Kolisi added to the coach’s sentiments.
“To latch onto what Jacques said, their team has been building for four years and we knew it would take everything (to win),” said Kolisi.
“For their captain to come back from an injury and the play the way he did was good.
“We knew how loud and intense it would be at the stadium, but the French people can be proud of their team. It was a tough game, and we knew it would take something special.”
While Nienaber was open about his excitement, he said the Boks still had work to do if they wanted to defend their title.
“There were good things and other things we didn’t do so well,” said Nienaber, “but there was the pressure of a knock-out game, and we know there is a lot we need to work on going forward.”
The Springboks will move hotels in Paris on Monday and will have the day off to rest and recover before returning to training on Tuesday for the semi-final.