Los Rojillos head into the weekend bottom of the table having collected just one point from five matches, but Flano is confident they can break their duck against a team that has been soundly beaten on their two away trips so far this term.
He told the club's website: "It is certain that due to the last five results there could be a certain disappointment and discouragement in the team.
"However, if we are all united, we are a strong team and difficult for any opponent.
"Right now there is nothing more than Levante (in our minds) - 90 minutes at our best and with the help of the fans we are going to take something from the game in front of us.
"I am sure that we are going to do it. We are a strong team but until now we have not demonstrated that."
The hosts will welcome back Joseba Llorente from suspension but captain Patxi Punal serves the last of his four-game ban and full-backs Marc Bertran and Damia Abella have also been ruled out through injury.
Levante boss Juan Ignacio Martinez, meanwhile, is anticipating a difficult time in Pamplona and reckons Osasuna are unlucky to still be without a win.
He told Marca: "It will be a very difficult match and we are aware of this ahead of time. We have to be very charged up because the rhythm will be very high.
"They are in a bad way and in a critical situation, although there have only been five games, but they are a very good team. They have played against important rivals and had them against the ropes. Barcelona beat them but they could have won that game."
Obafemi Martins looks set to make his first start for Los Granotes after coming on to score the winner against Real Sociedad last weekend, but Juanlu is not expected to be rushed back with Thursday's Europa League clash against Hannover in mind.