It remains unsure if Juan will be able to play for Roma in their Champions League clash with Cluj on Wednesday.
Roma defender John Arne Riise will also be out of action for two weeks with an injury.
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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.