Former Germany goalkeeper Jens Lehmann admits he'll be attending tonight's Champions League clash between Borussia Dortmund and AC Milan.

Lehmann is keen to see Milan keeper Mike Maignan live.

He told La Gazzetta dello Sport: "Maignan is strong, but I want to see him live to understand if he is among the top 5 in the world.

"(Gregor) Kobel is good, but he is still 25 years old and still young."

Lehmann added: "I see two teams with the same possibilities. Of course, the Gialloroneri play at home and that may be a factor."