Borussia Dortmund general manager Hans-Joachim Watzke worries Bayern Munich may disappear over the horizon after they raised 110 million euros in a share sale on Tuesday.
German insurance giant Allianz, who already sponsor Bayern's stadium, purchased an 8.33 per cent stake in the club, becoming an equal partner with Adidas and Audi.
The injection of fresh funds will take Bayern even further away from the competition, said Watzke, whose side have come closest to breaking the Bavarian club's dominance of German football in recent years.
"This development was predictable," he said. "They've been negotiating with Allianz for a long time and I can only congratulate them on the deal, but the gulf to the rest of the Bundesliga is obviously going to grow further because of it."
By striking the deal with Allianz, Bayern are still adhering to league rules, which prevent private investors from owning more than 49 per cent of a club, but also to their own more stringent regulations which dictate only 25 per cent of the club can belong to outside investors.
Allianz, Adidas and Audi now share that 25 per cent equally between them.
