3. Tolgay Arslan

How Beşiktaş snapped up Tolgay from HSV for just €500,000 is one of the great mysteries of last season. The 24-year-old is capable of pulling the strings in midfield and equally comfortable defending as he is going forwards. Arslan has impressive technical ability and Liverpool found out just how dangerous he can be if given space in the Europa League Round of 32. The former HSV midfielder opted to join the Black Eagles over Arsenal because he wanted to play regular first team football and he may be difficult to prize away considering he only joined the club in January but given the chance Bilic would not say no to working with the central midfielder again.

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