Qarabag is not at Leverkusen's current level, but looking at the statistics, this team has high fighting power in every match. Yes, even though we know that maybe the winner is Leverkusen, we need to watch this match to see how well Qarabag can withstand Leverkusen's attack. Moreover, currently Leverkusen is unbeaten in the domestic league or UEFA League. I don't think Xabi will underestimate all teams from any continent because if they make a blunder they will be slapped by teams at Qarabag's level.
I think Qarabag might not be as good as Leverkusen right now. But we should remember that numbers don't always show everything. Every game can have surprises. Qarabag works hard and never gives up so they can still do well.
Leverkusen is expected to win, but it's important to see how Qarabag plays and if they can surprise everyone. Leverkusen hasn't lost any games in their league or UEFA League which is good but it doesn't mean they will win every time. There can be a team which can come up and can defeat Leverkusen.