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Steven Vitória (Benfica) and Jores Okore (Aston Villa) have been omitted because I haven't seen enough of them to provide you something worth reading.
To give you an idea of the selection process, here are several players who weren't considered for the list.
Sokratis, CB, Age: 25 | From Werder Bremen to Borussia Dortmund
You can't say the Greek defender is one of the least talked about European summer transfers when he’s the reason why Jürgen Klopp is being branded a hypocrite.
Klopp and Dortmund management loathe the way Bayern Munich do business yet who nicked Werder Bremen centre-back Sokratis from Bayer Leverkusen? Dortmund.
"We had an agreement with the player and also with Werder Bremen," Leverkusen general manager Rudi Völler said to Bild via Sky Sports. "Now Papastathopoulos has cancelled the deal and joined Borussia Dortmund."
Diego Reyes, CB, Age: 20 | From América to Porto
There are many Mexican football aficionados expecting Reyes to have an illustrious European career like Rafa Márquez.
Of the medallists, Mexico conceded the least amount of goals during the 2012 Olympic group stage with him and Hiram Mier marshalling the defence.
Reyes has a significant profile and this article will only list players with small profiles.
Heung Min Son, CF/RAM, Age: 20 | From Hamburg to Bayer Leverkusen
He is Asia’s brightest talent and a footballer with the potential to be world-class.
By signing with Leverkusen, he will attempt to fulfill the boots of Cha Bum-Kun, arguably the greatest Asian footballer ever.
Like with Reyes, Son has a noted following.
Lazar Marković, LAM/DLF, Age: 19 | From Partizan Belgrade to Benfica
Prior to Benfica signing him, he was linked with a £6 million move to Chelsea, as reported by Rob Beasley at The Sun.
A great prospect but doesn't fit the purpose of this article which is to give exposure to unheralded footballers.