Borussia Dortmund sporting director Michael Zorc has confirmed that the club are interested in signing Manchester City striker Edin Dzeko in the summer.

However, Zorc says that a transfer is only feasible if the Premier League champions are willing to let the 27-year-old leave for a cheap price.

"There should be little doubt about Dzeko being a top-class striker," he told Bild. "He is a great forward and a player one should be keen on.

"However, there is also still somewhat of an economic aspect. [A transfer] would be down to pure maths because Dzeko is under contract at Manchester City beyond the end of the season."

Dzeko joined City from Wolfsburg in January 2011.