The Argentine schemer is recovering from a hamstring injury sustained against Paris St Germain in the Champions League quarter finals.
He came off the bench in the second leg of the tie but has been given time to recover since.
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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.