The midfielder was substituted in the 19th minute after alerting the Reds’ medical team to a pain in his back.
He was taken to a local hospital where he underwent a number of precautionary health checks to assess his condition.
Liverpool are scheduled to remain in Italy until Thursday morning and no decision has been made on when the 23-year-old will be discharged.
Lorenzo Insigne scored in the 90th minute to secure all three points for Napoli and condemn Liverpool to their first Champions League defeat of the campaign.
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