"I've had to deal with it. People are doubting me now and putting my back against the wall, but I want to show that I've still got it.
"People want to know if I'm gun-shy now, but I'm going to take control of the centre of the ring and throw bombs from the start.
"I like proving people wrong. I had a dream to unify the division before I fought Haye, and it's the same now. It's a long time since I fought and I've been angry for nine months now."
Alvarez, who has completed nine of his 11 wins inside the distance, is a late stand-in for American Johnathon Banks, who was forced to withdraw with an ankle injury.
Herbie Hide had been lined up to replace Banks but the former WBO heavyweight title-holder went 'missing' on Wednesday night after initially agreeing to the fight.
"I was happy when I heard it was Herbie Hide because he's the only man I really can't stand in boxing," said Maccarinelli.
"He's been saying a lot of things about me so it would have been nice to shut his mouth up. But he didn't want it."
Audley Harrison, who continues to blow his own trumpet, is another British boxer hoping to make an impression tomorrow.
He faces heavyweight Prizefighter winner Martin Rogan still claiming he can win a world title.
"I've seen the light. I will be heavyweight champion of the world. No doubt, 100 per cent," said the Olympic gold medallist.
But Rogan, a relative newcomer to boxing who, at 37, has a flawless record of 10 victories, is unimpressed by Harrison's.
He said: "Harrison won his Olympic gold eight years ago, this is now. He's got a great future in preaching and a great future in climbing mountains."