"I'd bet for sure that Milan will win the Champions League. I'm absolutely certain of it," Ferguson said in the Sun.
"I said to Carlo at the end of our semi-final that there is no way he can now not win this competition.
"Carlo gave me a magnificent bottle of wine.
"But I immediately told him I would only drink his win once I see him lifting the Champions Cup."
Ferguson was impressed by Milan's performance against his newly-crowned Premiership champions and believes it was one of the Italians' best ever showings.
"Milan's second-leg victory over us was stupendous, fantastic and extraordinary," added Ferguson.
"I know we paid a high price for the Premiership fightback which we needed at Everton to turn a 2-0 scoreline into a 4-2 victory.
"Last week, Milan were fresher and better prepared tactically and physically.
"I'm still trying to analyse the factors involved. But the truth remains we faced one of the best performances in the history of AC Milan."