Stefan Savic has joined Fiorentina as part of the deal.
Reports claim the deal that sees the youngster move to Eastlands is worth around £12million.
The 19-year-old impressed for Fiorentina in Serie A last season.
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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.