The Swede has been out of work since leaving Leicester City last season.
His agent said the deal would be with an open contract which could be short or long term.
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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.