Herbert Hainer, the Adidas CEO and a member of Bayern Munich's supervisory board, has told Sportbild Uli Hoeness will "do the right thing" as developments in the investigation into his alleged tax evasion are awaited.
In January, 61-year-old Bayern president Hoeness filed a voluntary disclosure which showed he had not paid tax on a Swiss bank account.
Reports suggest German prosecutors will decide in July whether or not he should face charges.
In May, Hoeness offered to resign, but his offer was turned down.
The Bayern board's unanimous decision to leave Hoeness in office despite the ongoing case was controversial. Some commentators in Germany said it did not seem to fit the compliance rules applied by Adidas and other corporations.
"It is pure speculation that we would have treated the case differently if an Adidas employee was facing similar charges" Hainer said.
"If the voluntary disclosure of Hoeness is accepted, he can remain president and head of the supervisory board. We will have to wait and see what the prosecutors say."
Asked whether he expected Hoeness to resign if charges are brought, Hainer said: "Uli Hoeness said it himself - he won't do anything that could harm the club. He is an intelligent man, and will do the right thing."