The two clubs are locked in negotiations, with the main sticking point what will happen at the end of the loan deal, with Arsenal keen for an option to buy.
Sahin is keen to join Arsenal and participate in the Champions League.
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Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.
Newcastle United are staring down the barrel of relegation to the Championship for the second time in the past eight years.