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Out of all the possibilities listed here, the signing of Manchester City's Carlos Tevez would in all likely hood be the biggest move Juve could ever want to pull off this coming transfer window.
The Argentine has earned the right through his time in the English Premier League and elsewhere that he is one of the best strikers in the world of soccer today. Tevez has been a game changer for every team he's ever suited up for and with the recent fallout between ManCity management and Tevez, Juve fans hope they can capitalize and get the striker into a black and white uniform this upcoming Summer.
Since joining Manchester City in 2009, "El Apache" has driven 41 balls into the back of an opponents net, the highest of his time with any club. He has scored 18 of those this season despite issues concerning his playing time.
Tevez is an elite, world class talent and recognized as one of the best strikers in European play, certainly somebody that could change the landscape of not just Juventus, but the entire Serie A. Adding the 27-year-old would significantly boost Juve's shots on goal in every game next season and give the club more opportunities in the opposition's side of the field.
Unlike some of the others named, this signing may prove to be less of a long term move considering the fact Tevez has had difficulties staying more than two years with a club, but it would be hard for any club to turn down the chance at such a talented forward.
Overall, any of these signings would prove to be a huge upgrade over any options Juventus currently has at the striker position, but Tevez in all likely hood would be the best player to break the bank for and certainly give more than a reasonable amount of production for his price tag.