Under FIFA's rotational hosting policy, the 2026 World Cup cannot be in either Europe or Asia, leaving Africa, Oceania and North or South America as possible destinations.
Despite reported interest from Chile earlier in the year, a joint Canada-Mexico-USA bid was formally announced in April.
Shortly before Friday's deadline for submissions, however, Moroccan football's governing body released a brief statement to deny an unopposed CONCACAF bid.
The 2026 tournament will also see the introduction of a 48-team format, after FIFA's confirmation in January.
Africa has only hosted the World Cup once, in South Africa in 2010, but this will be Morocco's fifth bid.
The host will be announced in May 2020.