UEFA president Aleksander Ceferin has warned that the season could be lost if games aren't back up and running by the end of June.
Football is suspended across all of Europe's major leagues due to the ongoing COVID-19 pandemic.
The Premier League have vowed to "indefinitely extend" their campaign in a bid to get it finished - but Ceferin says it would be difficult to do so should the break run into July.
"Nobody knows when the pandemic will end," he told La Repubblica. "We have a plan A, B or C: to restart in mid-May, in June or at the end of June.
"If then we wouldn't be able to do any of these, the season would probably be lost. There is also the possibility of ending this season at the start of the next, which would then be postponed, starting a little later.
"We're in touch with the leagues, the clubs, there is a working group and we'll see what solution is best for all. We have to wait, like any other sector.
"It's difficult to imagine all the games behind closed doors, but right now we don't even know if we will resume, with or without fans," he said.
"If there are no other alternatives, it would still be better to conclude the leagues. I can say that I'm not thinking about staging the European cup finals behind closed doors".