Fabinho
Henderson will miss Premier League games against Sheffield United, Chelsea, Fulham and Wolverhampton, as well as the Champions League last-16 second leg.
Liverpool have suffered another injury setback with Brazilian midfielder Fabinho set to miss Saturday's trip to Leicester.
Salah tested positive for COVID-19 and was forced to miss the two matches against Togo in 2021 Africa Cup of Nations Qualifiers.
Klopp said on Friday that he is looking for solutions in defence with Fabinho also sidelined with injury.
Fabinho has been filling in for Van Dijk in the centre of defence since the Dutchman suffered a serious knee injury.
Liverpool coach Jurgen Klopp stressed that his players Joel Matip and Fabinho will be out of the squad until the end of this year.
Fabinho was forced to leave the pitch after only 18 minutes to be replaced by Georginio Wijnaldum in the game which ended with a 1-1 draw.
The Champions League draw put Liverpool in Group E alongside Napoli, Salzburg and Genk.
Fabinho, 24, has grabbed the European clubs’ attention after his amazing performance with Monaco in the last two years.
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