Midfielder Fabinho was substituted shortly after coming on during Sunday’s 2-0 win at Cardiff City following a knock to the head, and Lallana has missed the Reds’ last five outings due to a muscular issue.
Lovren, meanwhile, did not travel for last week’s win over FC Porto because of illness and was also absent at the Cardiff City Stadium.
When asked about the trio’s availability for the meeting with the Terriers on Thursday, Klopp said: “All a bit questionable, we don’t know exactly in the moment. We will have to see today.
“We gave them all a proper rest. Dejan trained yesterday so that’s OK probably and the other two we will see.”
On Alex Oxlade-Chamberlain, the boss continued: “Ox trained, all good.”