The Spanish forward played for AS Roma for the last two seasons but is on the move again.
There is an option for the Dutch club to loan Bojan for a second season should they so wish.
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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.