The campaign, already dogged by confusion over the voting format, has been hit by a corruption scandal, with allegations of vote-selling by two FIFA executive committee members and collusion by unnamed bidding nations.
FIFA's executive committee is due to choose the hosts in Zurich on December 2 although there have been calls for the election of at least the 2022 hosts to be postponed to a later date. However, FIFA has so far ruled out this possibility.
FIFA's ethics committee, due to make a definitive decision on the pair on November 17, is also investigating claims of collusion and vote-swapping between unnamed bidders for the 2018 and 2022 bids.
Football's governing body is due to hold a media conference after the meeting to announce the committee's decisions.
England's bid team said it was withdrawing a formal complaint to FIFA after accepting an apology from Russia over critical comments.
