The young defender also was a summer target for Inter Milan.
"When I arrived I soon felt like I was in a family. Meeting an Agnelli there as President is the maximum," Bonucci said. "The relationship with him seems as though it has lasted a lifetime.
"I know that I still must improve. The partnerships at Milan, Inter and Chiellini, the player, are all still superior without forgetting the duo of Burdisso and Juan.
"I will grow even more here and in 2012 I see myself together with Chiellini, Ranocchia and Bocchetti in forming the group of centre-backs at the next European Championship.
"My wish right now is to be Juve's best signing [of the summer]."