Lisbon is the favourite to host an eight-team Champions League knockout tournament in August, if it is given the go-ahead by governing body Uefa.
Uefa is planning to move the final from Istanbul, where it was due to be held on 30 May, for the new format.
The Europa League final, due to be held in Gdansk, Poland on 27 May, is likely to be moved to Germany.
Europe’s continental cup competitions were stopped in March because of the coronavirus pandemic.
Uefa’s executive committee will make its decision on 17 June.