Should be asap.
Personally, i'll be gutted, we're doing great and may completely stop our momentum. But for player, stadium, training ground staff etc, it needs to happen.
I think UEFA are the most culpable people here, with the FA not much further behind.
You can spread the season so much more, if you just completely scrap the group stage of both European Competitions and wait until 2021, and have a "celebration", to European Cup and Uefa Cup. Include some qualifiers to balance it for EL, and go 32-16-8-4-2, and have a closing Tournament like they did last time. Istanbul is City for final, which has four 4* or above Stadia which can host the final 8 and you can hold that in April-May.
6 Matchdays, plus 1 month for final 16 is 10 unneeded matchdays, could easily have done this over 4. Likewise with Europa.
The FA should realise that this could happen and should have postponed the League Cup for one season, we played 3 weeks on the run in the cup, where an extra match day could have been played. Likewise with the Football League Trophy.
Instead, we're staring down the barrel of scenarios like Sunderland or Accrington, who will face 29/30 league games in 127 days, plus games in EFL Trophy.
Teams like Man City who are suffering from COVID, should they make long runs in all the remaining 3 competitions they're in face a potential 37 games before the end of the season, then have to deal with Copa America, Euros.