The former Southampton captain suffered lateral collateral ligament damage in training, an injury to the knee that isn't serious enough to require surgery, but has to be managed carefully to avoid a repeat problem.
Lallana's six weeks out will see him miss the rest of pre-season and almost a month of the new Premier League season.
Though the England man's injury is a big loss, especially as it damages his bedding in period at his new club, it may see Liverpool return to a player they have been linked with all summer.
Rumours of Swiss star Xherdan Shaqiri's move to Anfield haven't gone away despite the club signing both Lallana and Serbian starlet Lazar Markovic, or the fact that Bayern seem uninterested in negotiations.
The player scored 7 goals last season, though only played in 26 games for the German champions, and just this week reports surfaced of the Reds offering nearly £15 million for the former Basel star, who impressed during this summer's World Cup in Brazil. That figure is said to be close to what Bayern value their winger at, though it remains to be seen if they are willing to sell.
Shaqiri wouldn't just be a stop gap for Lallana, with his ability to play in any of the attacking midfield positions he could easily be rotated with Coutinho, Markovic and Raheem Sterling, leaving Rodgers with superb young attacking talent in depth were the 22-year-old to join.
Let us know below if you think Shaqiri would be a good signing for Liverpool or if you think Brendan Rodgers should be looking at someone else.
Should Liverpool sign the Bayern Munich star?