Luis Felipe Scolari said he was never really concerned about Ronaldo's thigh injury during the game against Turkey.
Ronaldo scored the goal which took Brazil into the World Cup final but was replaced by Luizao in the second half.
But coach Scolari was always confident that the striker would manage to play through the pain barrier.
Scolari said: "Ronaldo's injury did not really worry us. When I saw him with his strange haircut I knew that we would see his positive side.
"We knew from seeing him before the game and then during the game that he was fine.
"I only substituted him towards the end to keep him fresh for the final."
Scolari admits he is now looking forward to a reunion with Germany coach Rudi Voller when their teams meet in Sunday's final.
"I met Voller at the World Cup finals draw and it was a peculiar situation because both our teams had struggled to qualify.
"We hugged each other and I said to him 'I will see you in the final'.
"When I see him again I will give him another hug."