If we can beat Osasuna, we can beat anyone, even Teams like Werder Bremen or other good offensive playing teams. I saw Osasuna playing at home against Hamburg in the championsleague qualifiation and I can tell you, that they have a massive support in the pamplona region. But they are also playing very good solid, organized football as far as I can see. So, if we can get through such a team...anything can happen IMO.