The goalkeeper says they have done their homework following the 1-1 draw with the Russians at Anfield.
The Reds travel to Russia tonight looking to secure all three points for the first time in the Europa League this season following three draws so far.
They will however be boosted by their recent big win in the Premier League against Chelsea when they put in a highly accomplished performance at Stamford Bridge to win 3-1 on Saturday.
And Mignolet says they are fully focused on the European game, with Chelsea firmly in the past.
“There is huge belief and confidence within the group and that feeling of scoring goals and winning games, you want to keep it,” he told liverpoolfc.com.
“That’s why we’re looking forward to the next game. Everybody was very happy with the result against Chelsea, but that’s behind us now and there’s no point thinking anymore about it.”
The Reds were expected to walk their group in Europe this season, but have found the going tough, with FC Sion and Rubin Kazan both earning a point apiece at Anfield.
They are now sat second in Group B and relying on positive results in two away games to make it to the latter stages of the competition.
They were caught by surprise by they took on Rubin, but Mignolet insists they have done their homework and learned a lot from the 1-1 draw at Anfield.
“It’s not going to be easy away in Russia, but we’ll prepare ourselves to try to get the victory,” he added.
“After the home game and we know them a little bit better than in the first game and before Thursday we’ll analyse the games they’ve played since they came to Anfield so we’re up to date with everything.”