(CNN) -- The proposed super-fight between Manny Pacquiao and Floyd Mayweather Jnr has been thrown into doubt because of a dispute over the timing of a pre-match blood-test according to Golden Boy Promotions. Richard Schaefer, chief executive of Golden Boy who promote Mayweather, announced on the company's official Web site that the Filipino would not agree to blood-testing in the immediate run up to the welterweight fight which had been expected to take place in March. Mayweather's management have requested the fighters submit to Olympic-style blood testing as outlined and mandated by the United States Anti Doping Agency (USADA) 30 days prior to the bout.
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The Manny Pacquiao and Floyd Mayweather fight is in doubt over the timing of a pre-match blood test
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Golden Boy Promotions chief executive Richard Schaefer claims Filipino Pacquiao is refusing a test 30 days before the bout
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Mayweather called on Filipino to undergo the test to ensure a fair fight
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Pacquiao's promoter Bob Arum says the "plug has been pulled" on the fight
"I hope this is either some miscommunication or that Manny will change his mind and step up and allow these tests, which were good enough for all these other great athletes, to be performed by @placeholder."