Norway's football federation is set to abstain from the vote, arguing the bidding process "undermines Fifa's own reforms for good governance".
On Friday, the DFB - Germany's national football association - announced it would vote in favour of both bids.
"We did not make the decision lightly and carefully examined the application for the 2034 World Cup," DFB president Bernd Neuendorf said.
"We take the criticism of the applicant country seriously and will continue to engage in dialogue. Our goal is to work together with Fifa to improve the situation in the coming years."