The Reds look to get their European campaign back on track when they visit Lyon in France this Wednesday night.
It follows two consecutive defeats to the hands of Fiorentina and Lyon, leaving Rafa Benitez’s men third in the group and six points of group leaders Lyon.
“It would be a disaster for this club not qualifying for the knockout stages – but it’s not something we are thinking about,” said Johnson.
“We have still got to believe we can do it. We don’t even want to start thinking about the Europa League.
“It will be no consolation at all. It’s not the aim and it’s not the plan because we want to be in the Champions. It is one of the main reasons why players want to play for a big side.”