"I bought Cech but I never coached him," Ranieri told chelseafc.com.
"When I saw him in his national Under 21 team, in my opinion he was one of the best young goalkeepers. He was very sure, very good in the air, very fast across the pitch. He was full of every quality.
"When I bought him I thought there are now two goalkeepers for Chelsea and that is very important. I asked Roman Abramovich for two players for every position."