Former Barca No1 Zubi signed Ter Stegen when sporting director with the Blaugrana.
He said, "There weren't many goalkeepers in the world who played like this, now there are more.
"From the first moment we worked on the future and to detect talent. We saw that there was a young boy in Germany who played how we wanted and we launched ourselves for his signing.
"I have always said that Courtois would be one of the best goalkeepers in the world, but that he was a goalkeeper with a profile that Barça needed something else.
"We were clear that we wanted a goalkeeper similar to (Victor) Valdés."