Martin Demichelis claims to be free of injury and ready to stake a claim for a regular role at Manchester City.
The Argentine defender told the Manchester Evening News: "I feel like I am a 20-year-old again.
"It's a great experience to take part in the best league in the world.
"I have a lot of ambition, and have not come here to take a secondary role. I want to be part of the team and am confident I will do it.
"The knee feels really good and I feel I am fit and ready to play at Newcastle, but it is the decision of the manager."
Demichelis is convinced he can handle the demands of Premier League life and is delighted to be working under Manuel Pellegrini again.
"It's part of life, and it was my destiny," said Demichelis.
"When I arrived there, I heard about City and was keen to come here to work with Pellegrini again. I appreciate the effort City made to bring me here, so I want to repay them by helping them win titles."
He added: "I am very happy in Manchester - I obviously had a very difficult start as I picked up an injury, not the best beginning to life at a new club.
"But I have worked really hard to be back with my team-mates. I have a lot of experience and know injuries are part of the game."
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