Firmino was absent as the squad were put through their paces.
The boss had sung his praises in the pre-match press conference, but immediate reports state there is no cause for concern, with it likely a precaution amid a hectic schedule.
Mohamed Salah was part of Liverpool’s preparations for their Champions League clash against Atalanta, but there was also no sign of Thiago or Jordan Henderson.
Similarly, Xherdan Shaqiri remained sidelined and took no part.
