Lallana has played in 27 of Liverpool's 29 Premier League games this season, scoring seven goals, and his absence is likely to be keenly felt as Juergen Klopp's side look to cement a top-four finish during the remainder of the season.
Liverpool are in fourth place on 56 points, four clear of fifth-placed arch-rivals Manchester United, who have two games in hand in the race for Champions League qualification.
Lallana's first game on the sidelines will be Saturday's Merseyside derby at home to Everton.
Liverpool were not immediately available for comment when contacted by Reuters about Lallana's injury.
(Reporting by Toby Davis; Editing by Ken Ferris)
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