The Mali international signed from Liverpool for a fee that will amount to £8.2m and has arrived early in Turin due to his elimination from the African Cup of Nations.
"To arrive at one of the biggest teams in the world at the age of 23 is a big challenge - they were my first choice and I never had any doubt.
"Since I was young I have had a particular admiration for Del Piero and I enjoyed watching him play - it's hard to believe that I am his teammate.
"This year we want to qualify for the Champions League and I am ready to play against Cagliari on Sunday.
"I spoke to Jonathan Zebina and he explained to me how the club works and talked to me about life here. I feel a great responsibility, but also pride.
"What should you expect from me? I am an aggressive midfielder," he continued. "When I first started playing for Liverpool I got lots of yellow cards, but then I learned how things work. My job is to get the ball back and make the team play.
"Comparisons with Vieira? He has already shown that he is a great champion and I need to prove that I am too."