It is appealing for charities to convince their sponsors to put forward employees to take part.
Fighters will pay for 20 weeks' training in the run-up to the bouts, which will take place at black-tie gala events funded by the charity's corporate partners.
Since the club was launched in 2000, it has held about 20 similar events, raising £800,000 for charities.
"We had a major black-tie event last year and raised £90,000 for Sparks, the children's medical research charity," said spokesman Nick Stafford-Deitsch. "We are keen to raise the profile and increase the number of these events, and I don't see why we couldn't raise the same amount for other charities."
But a spokesman for Headway, a brain injury charity, criticised the scheme. "We cannot condone an activity that carries such a high risk of brain injury, for however good a cause," he said.
