Mats Hummels, Borussia Dortmund
Perhaps the least likely of the bunch with Dortmund manager Jurgen Klopp insisting the 25-year-old is not for sale and Hummels unlikely to move to a club without Champions League football.
However, landing the Germany international would be a great coup with the World Cup winner considered to be among the finest defenders on the planet.
Source: Independent.