Gazzetta dello Sport claim that the Spanish giants have registered an interest in the Montenegrin forward.
Arsenal, Juventus and Chelsea are amongst the clubs thought to be after the 23 year old.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.