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LIVERPOOL, ENGLAND - NOVEMBER 01: (THE SUN OUT, THE SUN ON SUNDAY OUT) JUrgen KLopp Manager of Liverpool substitutes Firmino for Sturridge during the UEFA Champions League group E match between Liverpool FC and NK Maribor at Anfield on November 1, 2017 in Liverpool, United Kingdom. (Photo by John Powell/Liverpool FC via Getty Images)

LIVERPOOL, ENGLAND - NOVEMBER 01:  (THE SUN OUT, THE SUN ON SUNDAY OUT) JUrgen KLopp Manager of Liverpool substitutes Firmino for Sturridge  during the UEFA Champions League group E match between Liverpool FC and NK Maribor at Anfield on November 1, 2017 in Liverpool, United Kingdom.  (Photo by John Powell/Liverpool FC via Getty Images)

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LONDON, ENGLAND - FEBRUARY 09: Jurgen Klopp, manager of Liverpool talks to Daniel Sturridge of Liverpool during the Emirates FA Cup Fourth Round Replay match between West Ham United and Liverpool at Boleyn Ground on February 9, 2016 in London, England. (Photo by Mike Hewitt/Getty Images)

LONDON, ENGLAND - FEBRUARY 09:  Jurgen Klopp, manager of Liverpool talks to Daniel Sturridge of Liverpool during the Emirates FA Cup Fourth Round Replay match between West Ham United and Liverpool at Boleyn Ground on February 9, 2016 in London, England.  (Photo by Mike Hewitt/Getty Images)