Johnson and Cissokho have missed several weeks of action due to ankle injuries, while a hamstring complaint has prevented Allen from featuring since August's Capital One Cup win over Notts County.
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Rodgers said: "Glen's out on the field and hopefully after the international break he'll be ready to come back into the squad.
"We're okay. Aly Cissokho has trained over the course of the last week or so, so I think after the international break he'll be fine and fit. Joe Allen likewise - he should be ready for the Newcastle game.
"Glen Johnson and Coutinho will not be long after.
"Obviously Sebastian Coates will be that bit longer and has a bit more to do yet, but apart from that we're getting back to our numbers now."