Kleberson admits regrets over his time at Manchester United.
Kleberson, 30, now with Flamengo back in Brazil, signed for United for £5.93m. He was sold to Besiktas for £2.5m two years later after just 24 starts and two goals. Fatally, he never got on with Alex Ferguson.
He admitted: "I arrived in Manchester, along with Ronaldo, with a lot of hope but left with huge sadness. An injury in only my second league match proved a very negative factor and in my second season I wasn't given many chances.
"My Brazilian coach Dunga had more faith in me than Ferguson. I believe I could have been a bigger success in English football. But not everyone is guaranteed success at United."