Viduka scored 19 goals for Boro last season

The 31-year-old Australian has been offered an extended deal by Boro boss Gareth Southgate but has yet to give an answer to the Teessiders.

Newcastle say they have no comment to make about Viduka's possible switch from the Riverside to St James' Park.

Portsmouth and West Ham are also believed to be keen on Viduka and Birmingham have reportedly joined the chase to sign him as well.

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Viduka is currently on a break before joining the Australia squad to play in the Asian Cup.

Talks are set to continue between the striker's camp and the Magpies later in the week with the ex-Celtic and Leeds player appearing certain to end his three-year spell at Boro.

Viduka was signed for the Riverside outfit in July 2004 by former Boro boss Steve McClaren in a �4.5m from Leeds.

He scored 19 goals last season as he played a major part in helping Southgate avoid relegation in his first season in charge.

A potential move to St James' Park would see him join new Newcastle boss Sam Allardyce's overhaul of the squad.

Allardyce took over the Magpies just two days after the end of the Premiership season and one of his main tasks in the striker department will be to persuade Michael Owen to stay.