The Australian forward's future has been a hot topic of debate for some time, as he has allowed his contract with Middlesbrough to wind down in order to consider all his options.
Boro have strived to strike a new deal with their key forward, but he has rebuffed their attempts to persuade him to sign on the dotted line.
Newcastle have long been thought to be favourites to secure the services of the former Celtic man, but reports at the start of the week claimed Birmingham had come in with a late gambit.
"Until he has actually signed for anybody, there is always a possibility," Blues chairman David Gold told The Sun.
If his comments ring true, then Gold will still hold some hope of landing the striker.
However, Sky Sports News understands Viduka has opted to pledge his future to Newcastle.
Viduka is currently on international duty with Australia so is unlikely to pen a deal in the coming days, but reports suggest he will be trotting out at St James' Park in the new season.
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