The unique competition between the Champions League last eight in August is likely to produce a surprise winner, according to Abel Xavier.
Former Portugal international Xavier is thrilled the country's capital city of Lisbon will host one-off matches from the quarter-final stage onwards as the competition ends with a mini-tournament.
Atalanta and RB Leipzig are among the teams already to have secured their place in the last eight, along with Paris Saint-Germain and Atletico Madrid.
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Lyon and Napoli are hoping to upset Juventus and Barcelona respectively when the last-16 stage is concluded, while Bayern Munich and Manchester City – who lead their own ties – are rated as favourites to win the competition.