The 28-year-old has joined the Latics for an undisclosed fee.
Kone scored 15 goals in 34 games for La Liga side Levante last season.
Kone has signed a three-year contract with the Cottagers.
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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.