Manchester United boss Sir Alex Ferguson rates Manchester City's Champions League group the "group of death".
Ferguson, whose own side were handed a favourable draw by comparison, said Napoli posed a major threat to City's chances of progressing to the knockout stage.
"It's a tough group that - the group of death," said Ferguson, speaking to Italian media in Rome this week.
"Napoli are in the toughest group. It's a very difficult group.
"If Napoli survive that, they'll have a right chance. It's not impossible.
"The atmosphere in Napoli is very volatile. With 75,000 to 80,000 [in the stadium], it's a great atmosphere."
