Manchester City manager Roberto Mancini says luck will be key in determining who progresses from the 'group of death'.
City are in Group A of the Champions League along with Bayern Munich, who are currently top of the Bundesliga, Villarreal, who were fourth in Spain last year and Napoli, who finished third in Italy.
Mancini believes that this campaign could see the Citizens reach the final in Munich next year, or crash out in the group stage.
They make their debut in the competition at home to fellow first timers Napoli on Wednesday and the Italian said: "It is so strong that there is a chance we could finish top and a chance we could finish in fourth position.
"The aim for us will be to qualify for the second stage. The Champions League is a difficult competition. You can have a top team, but you also need luck.
"Napoli are a good team. They play good football, they have a good group of players and they have fantastic supporters. This game will be very hard for us.
"I like (Edinson) Cavani. He is a fantastic striker who works for the team.
"But they also have (Ezequiel) Lavezzi, (Goran) Pandev and (Marek) Hamsik - and those players are very dangerous."