UEFA president Aleksander Ceferin has warned that the 2019/2020 season could be over if football does not resume by end of June.
Football activities in almost every European county have been suspended due to the coronavirus pandemic. The only country where the league is still on is Belarus, which has so far reported only 94 cases.
No date has been set for the return of football in any country.
Ceferin's UEFA has already suspended the Champions League and Europa League, and also postponed the planned May finals in Istanbul and Gdansk respectively.
But although every major league currently remains committed to finishing the 2019-20 season at some stage, Ceferin has said that time may ultimately run out.
"Nobody knows when the pandemic will end. 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," Ceferin told La Repubblica.
With many countries either in a state of a lockdown or having imposed social distancing measures, the prospect of football in full stadiums would appear an unlikely scenario in the weeks and months ahead.