6- Mesut Ozil | Arsenal

Cost: £44m

Despite the financial implications, this one was always going to make it into the list.

Ozil's surprise transfer from Real Madrid to Arsenal on deadline day not only shocked the majority of Premier League fans, it was also a catalyst for the Gunners brilliant start to the season.

Since his initial impact he may have slipped off the radar a little, but he is truly a world-class acquisition. 

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