If Robert Page’s side win, the Wales manager will then have to wait several months before knowing who they will face – and when – for a place in Qatar 2022 later this year.
Discussions are under way over a new date for Scotland versus Ukraine, with the Nations League window in June the most likely option.
The final could then also take place shortly after, though Wales are currently due to host both Belgium and the Netherlands this summer in addition to trips to Rotterdam and Poland.
“Alternative fixtures for teams in the March window are being explored by the relevant parties.,” Fifa said in a statement.
“Similarly, the details of rescheduled fixtures will be announced in due course and the international match calendar window of June will be adapted as necessary for the teams concerned once these details have been finalised.”
Last week FAW chief executive Noel Mooney said they would do whatever the could to show solidarity with Ukraine.
“We are a football family at the Football Association of Wales. We love football but we’re also socially conscious as well,” said Mooney.
“Like anybody else we’re appalled and disgusted by what’s happening right now with the Russian invasion of Ukraine.”
The World Cup finals take place from 21 November to 18 December and the the draw for the tournament is scheduled for Friday, 1 April in Doha.