"You can't really make comparisons," Trapattoni told Bild. "Lewandowski is Lewandowski and Immobile is Immobile.
"But Ciro is a smart player who's cold in front of goal.
"Dortmund are on track to be one of the best clubs in Europe, and I'm sure Immobile will help them do that.
"I don't think he's fully developed yet, but I know that he will grow in Dortmund under Klopp, who is one of the best around."
For the big stories and the banter follow us on Twitter: @tribalfootball