The Turkish international will join on loan with a view to a permanent deal.
Sahin was the best player in Germany two years ago as he helped Borussia Dortmund claimed the league title.
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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.