On Saturday's defensive display against Brentford and if it concerns him, Klopp said: "I don't think it's that much of a concern but we do have to show reaction that's for sure.
"It's tricky to win a football game when you are not defending on your highest level and that is what we didn't do.
"Porto is a different team and will play a different style but we will go direct as well and go for second balls so, we yeah we have to improve in that department for sure."
The German added: "Porto always change a little bit, they've had players going out and in, still the same manager.
"It's not an advantage at all that we won the last two games because the opponent will not want the same thing to happen again so it makes it not an easier job for us.
"But we don't think about the last two games we think about this game, they have different opportunities to set up their line-up and system and we have to prepare for that."
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