The future of this season's Champions League is set to be decided at a UEFA meeting on Wednesday, when plans for a 'final eight' tournament are presented.
UEFA's executive committee are expected to sign-off on the condensed format, which would see the quarter-finalists head to Portugal for a mini-tournament in August.
But with ties scheduled to take place over one leg, on neutral ground and without fans, it promises to be an end to the competition unlike anything we've seen before.
Here, Sportsmail tells you everything you need to know about UEFA's radical plans to crown the best team in Europe.
Why portugal?
Spain, Germany and Russia had all been mooted as potential hosts for the mini-tournament, but Portugal appears to be the unanimous choice.
The country's location is said to have played a part in the decision, as did the fact Portugal have no teams left in the competition.
Lisbon emerged as an attractive host city because it has two stadiums with the facilities needed for elite matches - Benfica's Estadio da Luz and Sporting Lisbon's Estadio Jose Alvalade.
Portugal's top-flight, the Primeira Liga, resumed on June 3 behind closed doors and there have not been any major problems reported.
Most of the country's coronavirus restrictions are also being lifted this month, with air travel in and out of the country allowed from June 22.
Visitors will not need to go into quarantine on arrival, although additional health and safety measures will be in place in a bid to prevent the spread of coronavirus.
So teams won't have to quarantine?
Not under the current rules, no.
Like many European countries, Portugal is keen to reopen to tourists for the summer months and will soon be welcoming people from abroad.
The land border with Spain, which was hit particularly hard by the pandemic, will remain closed until July 1, while people visiting the Azores or Madeira islands will be tested upon arrival.
Portugal has so far recorded just over 37,000 confirmed cases of coronavirus and 1,520 deaths, although the numbers have slowed greatly in recent weeks.
Providing there is not a second spike, the country's rules on borders and travelling should be the same when teams arrive for the tournament in August.
Each club are likely to set up in their own hotel away from the public so that social distancing measures can be maintained.
According to the BBC, the abundance of suitable accommodation in Lisbon was another reason UEFA have opted for the Portuguese capital.
How will the tournament work?
The 'final eight' tournament will be held over 12 days in Lisbon, with the first match taking place on August 12 and the final being played on August 23.
UEFA earmarked August as the month to complete the competition - and the Europa League - in order to give Europe's top domestic leagues enough time to finish their respective seasons.
Instead of playing the quarter-finals over two legs as normal, the new plan will see the ties become single games across four straight days.
The semi-finals, which will also be played over one leg, will take place on August 18 and 19, with the final at the Estadio da Luz four days later.
Istanbul was due to host the 2020 final but will now be the venue for the 2021 showpiece, with all other scheduled hosts moving back a year.
The teams already qualified for this season's quarter-finals are France's PSG, Italy's Atalanta, Spain's Atletico Madrid and Germany's RB Leipzig.
The remaining last-16 second-leg fixtures are Manchester City's home tie against Real Madrid, Chelsea's trip to Bayern Munich, Juventus's home game against Lyon and Napoli's visit to Barcelona.
So what about the rest of the last - 16 games?
UEFA were keen on completing the remaining last-16 second legs in Portugal before the mini-tournament begins, but that idea now looks dead.
Clubs are against the idea of giving up home advantage, particularly with each of the ties - apart from Bayern-Chelsea - finely poised ahead of the second legs.
City beat Real Madrid 2-1 at the Bernabeu, Juventus lost 1-0 at Lyon and Barcelona were held to a 1-1 draw at Napoli.
Last week, Barca boss Quieque Setien said: 'It would be damaging for us to play Napoli on neutral turf, seeing as we already faced them on their home ground at the San Paolo.
'If this is the scenario, then we'd have to accept it. Things are still up in the air, there are various suggestions, so we'll see what happens.'
It appears that Setien has got his wish and it now appears increasingly likely that the second legs will be played behind closed doors at their scheduled stadiums.
Will it be behind closed doors?
Organisers are proceeding on the basis that all matches will be played behind closed doors, with only essential personnel allowed on site.
However, UEFA are understood to have left the door open for possible changes should public health conditions in Portugal allow.
If government guidelines are altered in time for ticketing to be organised, there is an outside chance that some fans could be allowed in to watch.
The capacity of both grounds would be greatly reduced in order to comply with social distancing rules and other safety protocols.