"I am confident I can do it and the club are also, which they have shown by their faith with the contract. Now it's down to me to prove that."
Injuries have plagued Ameobi's progress and he spent five months on the sidelines after having hip surgery in November 2006.
Almost half of his 244 appearances have been as a substitute.
But current Newcastle boss Joe Kinnear has several other injury problems in his squad and is keen to retain his players and make new additions.
Ironically, Ameobi missed the FA Cup stalemate against Hull at the weekend with another hamstring injury, although he hopes to return for the home league match against West Ham on Saturday.
Speaking of his extended contract, Ameobi, who needs one more goal to reach 50 for the club, said: "I'm delighted to sign a new deal and commit my future to Newcastle United.
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