The Daily Mail reports that some McLaren staff, upset about the British team's current troubles even after the end of the Honda era, have put together a delegation that is reaching out to Whitmarsh.
Whitmarsh stepped down as McLaren team boss in 2014, after 25 years with the Woking outfit.
"People at McLaren said they would send me a letter about the situation. I told them not to send it to me, but to [team shareholder] Mansour [Ojjeh]," Whitmarsh confirmed.
"I love the team and I am desperately sad to see what it has become," Whitmarsh continued.
"It needs a big change of approach. There is too much politics between the main figures. I think a number of them have to go.
"I have explained my view to Mansour and it is for the shareholders to decide what to do."
Whitmarsh suggested that he is siding with those staff who think that Brown in particular is spreading McLaren's interests too far beyond the F1 paddock.
"The team used to be all about winning in Formula 1," he said. "McLaren going in [another] direction, rather than making grand prix racing their sole priority, makes me shudder."
Whitmarsh said that it was the departure of Tim Goss that pushed him "over the edge" in support of a revolt.
"He was scapegoated," he said.
"If a delegation showed up at my door, I wouldn't turn them away. They know where I am."
McLaren are fifth in the team rankings ahead of this weekend's French Grand Prix.