The readers have spoken and the Brazilian playmaker comes out on top.Earlier this week, Goal.com asked the readers to vote on the best deal of the transfer window.
It was a record-breaking summer, with Cristiano Ronaldo becoming the most expensive footballer of all time.
Manchester City invested heavily on proven Premier League talent, like Emmanuel Adebayor and Carlos Tevez, while Barcelona added Zlatan Ibrahimovic, among others.
However, it is in Serie A where the summer's best business was conducted.
A landslide poll victory for Diego proves that Juventus pulled off a great coup when landing the Brazilian from Werder Bremen.
The playmaker has already made an impact on Serie A, netting a brace against Roma last weekend, and is tipped to be the man to elevate the Old Lady to title contenders.
Here are the results in full: