Bernie Ecclestone has warned that his demise could have serious repercussions for Formula One.
Switzerland's Blick reports that German prosecutors could announce their intention to charge the F1 chief executive with bribery as early as next week.
And the Suddeutsche Zeitung newspaper said British tax authorities are also closing in on the diminutive Briton.
It has been suggested the corruption scandal could cost Ecclestone - who although apparently fit and healthy is now 82 years-old - his job at the helm of the sport.
But Ecclestone told business journalist Christian Sylt his departure could have serious consequences for F1.
"One day, I'm not going to be there and one of the biggest problems is I've got really, really good relationships with the race promoters," he is quoted by the Independent.
"A few of them said to me, 'if you're not there, we're not there'. That's what the danger is," said Ecclestone.