3: Mario Gotze | Bayern Munich

Cost: £32m

Bayern cemented their status as the top European powerhouse when they captured the signature of one of the most promising young players on the planet from their arch-rivals.

Gotze has already showcased his talents on a number of the grandest stages around, and he's only 21. 

He may have cost quite a bit but the transfer fee is paying dividends already, and is likely to do so for a long time to come. 

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