After the coronavirus pandemic cut short the European tournaments just as the latter stages began, they were pushed back to August.
Domestic competitions were given priority for football's return with Uefa asking associations to wrap up their own leagues and cups by the end of July.
Authorities have also shifted both tournaments away from their usual two-legged clashes to a new streamlined format, finishing in neutral venues and behind closed doors to ensure maximum pandemic safety.
The Champions League will head to Portugal for completion at Lisbon's Estadio da Luz and Estadio Jose Alvalade.
Meanwhile the Europa League is due to be completed in Germany with Cologne, Duisburg, Dusseldorf and Gelsenkirchen's stadiums utilised - all situated in the country's north-west.
Kicking the mini-tournament off will be the Europa League last-16 ties on August 5 and 6.