The 26-year-old, who secured a £26million to Anfield earlier this month, suffered knee ligament damage during a session at the club’s training base in Boston, as the Reds continue their pre-season tour of the United States.
The Merseyside outfit have offered no timeframe on the midfielder’s likely return to fitness, though such injuries can result in a spell of anywhere up to six weeks on the sidelines.
Liverpool did at least confirm Lallana’s injury does not require surgery, following an assessment carried out by club medical staff.
However, the news is clearly a setback for the England international, who will undergo further assessment in America and on his return to Liverpool.
The injury means the former Southampton captain will almost certainly miss Liverpool’s opening game of the campaign against his old club at Anfield.
