Heavyweight boxing champion Vladimir Klitschko has been speaking ahead of his fight against American challenger Eddie Chambers.
The challenger, aged 27, has won 35 and lost just one of his fights since turning professional in 2000, but now faces the biggest challenge of his career so far.
"It's going to be very difficult, but I'm prepared for it," the man from Philadelphia said.
Klitschko, 33, last fought in June when he beat Ruslan Chagaev with a technical knockout in the ninth round and is looking forward to the challenge.
"I feel great. I'm obviously happy to be back in the ring after a nine-month break and in front of a big audience like here in Duesseldorf. This is a special motivation for me," he said.
"He is definitely dangerous and super fast," Klitschko said of his American opponent. "He is very agile, very athletic and above all, he is mentally prepared to take the title away from me."
He added: "Of course I won't allow that. I have to say, I will be very alert and punchy on Saturday night."
