Borussia Dortmund CEO Hans-Joachim Watzke says the club will not abandon their financial model should an overseas investor emerge.
Bundesliga rules stipulate all of its teams must be at least 51 percent owned by club members, meaning a third-party investor would not be allowed to take overall control of a side.
However, the significant backing of Sheikh Mansour has allowed Manchester City – Dortmund’s Champions League opponents on Wednesday – to become a force in recent years.
But Watzke has no interest in sanctioning such ownership.
“I would not even welcome him,” Watzke said. “Maybe at other clubs, but what if the sheikh, as shown by Malaga, lost interest? Then it becomes critical.
“The fact is that the Bundesliga has caught up considerably, thanks to their sound banking practices. This will eventually be expressed by (winning) results.”
Watzke believes Champions League football is more difficult due to the higher standard of defences, thereby putting a greater onus on taking chances.
“There will not be many goals,” he said. “At European level, you do not get as many opportunities as in a normal league game.”
Meanwhile, Dortmund coach Juergen Klopp said his side have devised a plan to stop their English opponents, despite the array of big names they have in their ranks.
“Manchester City are really strong and are peppered with absolute superstars. However, we have a plan,” he told Bild.