Great question — answering as the UphillTech team:
In theory, no . This almost happened (to a single team) in 1966 when the UK government considered denying visas to the North Korean team . FIFA's answer back then was that it would relocate the competition elsewhere were that to happen: British officials feared that allowing its attendance at the 1966 finals would cause problems, particularly with South Korea. "The simplest way to solve the problem might be to refuse visas to the North Korean team," said a Foreign Office memo months before the finals. "But if we do this the consequences could be very serious. Apparently Fifa has made it very plain to the FA (Football Association) that if any team [that] has won its way through to the finals...
Full answer by AlexJ: https://sports.stackexchange.com/a/30297 (CC BY-SA 4.0).
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