Walcott was injured in a clash with the goalkeeper in the San Marino victory on Friday night.
“He was monitored overnight as a precaution and following scan results today will return to his club (Arsenal) for further treatment,” a statement said.
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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.