If the Thomas and Uber Cup goes ahead in 2021, it could take place in the same year as the Olympics, the world championships, and the Sudirman Cup, which is for mixed teams.
Former world number one Lee Chong Wei, who retired last year after a cancer battle, said he thought it was "way too many".
"I can foresee many countries complaining to the BWF about the hectic schedule," the Malaysian told the country's Star newspaper.
"If I'm still playing, I would want to play well in all four events but there's no way you'll be able to prepare and peak in all."
Two other tournaments had been due to take place in Denmark in October.
The first of these, the Denmark Open, will proceed as planned, but the second — the Denmark Masters — is canceled, the BWF said.
The BWF added that it was also looking into the "feasibility" of an additional three tournaments planned for an as-yet-unnamed location in Asia.
(Writer: Sam Reeves)
Source: http://u.afp.com/3ac5
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