According to the sporting principle. UEFA decided what to do with unfinished tournaments
If national Championships are not finished due to the pandemic coronavirus, designated in the European competitions next season will be distributed by a sports principle. That is, in the current League standings in the leagues.
Because in some competitions, not all clubs played the same number of matches will be considered the average score.
According to information published in several sources, this decision was taken by the UEFA Executive Committee at its teleconference today, April 23. This decision concerns the qualification in the Champions League and the Europa League.
Previously considered options in which the representation in the European Cup 2020/21 will be determined by the current club rating of UEFA.
Hearing UEFA”s executive committee has just decided that if leagues do not finish then qualification for Champions League/Europa League should be on sporting merit (which sounds like points per game)
— Martyn Ziegler (@martynziegler) April 23, 2020