The Reds’ No.1 is set to be out of action for ‘the next few weeks’ due to the issue he picked up during the first half of last Friday’s 4-1 win over Norwich City.
Adrian will step up to be first-choice goalkeeper in Alisson’s absence, and Klopp has confirmed that Lonergan - who was part of Liverpool’s squad during pre-season and has continued training at Melwood - is set to sign a short-term contract with the club.
Lonergan is also likely to be on the bench for Wednesday’s UEFA Super Cup tie with Chelsea in Istanbul.