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LIVERPOOL, ENGLAND - DECEMBER 16: Liverpool's Roberto Firmino battles with Manchester United's Matteo Darmian during the Premier League match between Liverpool FC and Manchester United at Anfield on December 16, 2018 in Liverpool, United Kingdom. (Photo by Alex Dodd - CameraSport via Getty Images)

LIVERPOOL, ENGLAND - DECEMBER 16: Liverpool's Roberto Firmino battles with Manchester United's Matteo Darmian during the Premier League match between Liverpool FC and Manchester United at Anfield on December 16, 2018 in Liverpool, United Kingdom. (Photo by Alex Dodd - CameraSport via Getty Images)

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LIVERPOOL, ENGLAND - DECEMBER 16: Roberto Firmino of Liverpool battles for possession with Matteo Darmian of Manchester United during the Premier League match between Liverpool FC and Manchester United at Anfield on December 16, 2018 in Liverpool, United Kingdom. (Photo by Clive Brunskill/Getty Images)

LIVERPOOL, ENGLAND - DECEMBER 16:  Roberto Firmino of Liverpool battles for possession with Matteo Darmian of Manchester United during the Premier League match between Liverpool FC and Manchester United at Anfield on December 16, 2018 in Liverpool, United Kingdom.  (Photo by Clive Brunskill/Getty Images)

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LIVERPOOL, ENGLAND - DECEMBER 16: Roberto Firmino of Liverpool battles for possession with Matteo Darmian of Manchester United during the Premier League match between Liverpool FC and Manchester United at Anfield on December 16, 2018 in Liverpool, United Kingdom. (Photo by Clive Brunskill/Getty Images)

LIVERPOOL, ENGLAND - DECEMBER 16:  Roberto Firmino of Liverpool battles for possession with Matteo Darmian of Manchester United during the Premier League match between Liverpool FC and Manchester United at Anfield on December 16, 2018 in Liverpool, United Kingdom.  (Photo by Clive Brunskill/Getty Images)