The Ivorian forward is highly rated after scoring 31 goals in 30 games last season for the Dutch side.
Chelsea and Newcastle are among the other teams interested in a player who seems likely to be in the Premier League next 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.