Borussia Dortmund coach Jurgen Klopp has admitted that he is looking forward to facing Jose Mourinho's Real Madrid in Wednesday's Champions League Group D clash.

Dortmund are second to Real in the group and could go above the Spaniards with a win, but Klopp said that Real have rarely been as good as they are currently.

"It is a huge challenge," UEFA.com quotes Klopp as saying. "I have watched Madrid a lot, and I saw them in Amsterdam where they put in a huge performance.

"They were tactically disciplined, quick, showed anticipation, pressed and counterattacked while playing football of a high technical standard. That left quite an impression.

"I have seen Real Madrid a lot but hardly ever this good."

Dortmund are three points clear of closest challengers Manchester City.