Carlos, who was a part of Brazil's 2002 World Cup winning team besides playing for 11 years for Spanish giants Real Madrid, said he really worked hard during his stint in Delhi Dynamos who qualified for the semifinals in the ISL.
"When I was in Delhi I did a lot of work with my players but they found it hard to take them. They don't all have the quality you need," Carlos said.
Asked about his future, Carlos said his ultimate goal is to become Brazil coach one day. He had said that he will not return to Delhi in the coming ISL season but there were reports that ISL side Mumbai City FC are having negotiations with him to be their coach in the ISL this year.
"If I do a good job at the club where I am now, I'm sure there'll be a lot of clubs who want Roberto Carlos as a coach. I’m a modern coach when it comes to training. I pick a lot of things up and I watch a lot of training sessions and follow a lot of leagues around the world. I'm taking things slowly, though," Carlos said.
"My goal one day is to be Brazil coach, but to get there I need to have a club career. I started well in Turkey. I started well in Russia and I did a good job in India," he was quoted as saying.
Asked about any footballer around today who can take free-kicks like he did in his playing days, he said, "Cristiano, Cristiano Ronaldo. Nobody strikes the ball like him. I used to hit it with the outside of my foot or the instep, but Cristiano hits it with the front part, which makes the ball dip quickly. Who else is there? There aren't many who can take good free-kicks."

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