Champions League knockout matches will be played in a 12-day tournament in Lisbon in August, according to UEFA.
The eight clubs remaining in the Champions League will take part in a knockout tournament between August 12 and 23.
The four remaining last-16 second-leg games, which includes Manchester City vs Real Madrid, will take place on August 7 and 8.
However, UEFA is yet to determine whether those games will take place at the respective host stadiums, or in Portugal, but said a decision would be made about it before July 10.
Paris Saint-Germain, Atalanta, Atletico Madrid and RB Leipzig are the only four teams who have already guaranteed their places in the last eight.
UEFA president Aleksander Ceferin confirmed they will decide by mid-July whether supporters could be present at the Champions League and Europa League tournaments.
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He said: “If I would answer today, we don’t think we could have spectators at the Champions League or Europa League finals, but things are changing rapidly.
“We will assess the situation at the beginning of July and we will see what the situation will be. It would be incompetent from us if we were to decide in advance about the situation.”
In addition, the culmination of this campaign’s Europa League from the last eight will take place in four venues in Germany between August 10 and 21.
And, all remaining games in the Women’s Champions League will be played as a knockout tournament in Bilbao between August 21 and 30.