Wycombe Wanderers managing director Steve Hayes has joined the board of London Wasps Holdings (LWH) Ltd, and bought an 11.6% stake.
Wasps have groundshared at Wycombe's Adams Park home since 2002 and the two clubs are looking at the feasibility of building a new stadium in the area.
"The relationship we have with Wasps is now planned to evolve into a deeper long-term partnership," Hayes said.
"My being on the board will help ensure the two clubs' ambitions are aligned."
Adams Park currently has a capacity of 10,000.
Wasps vice-chairman John O'Connell added: "As current European champions and having won 10 trophies in the last 10 years, we are clearly going to soon outgrow the current capacity.
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