The Aussie striker has been attracting a number of clubs, but Boro are the only one showing any real interest and may be a useful option as it would mean he would not have to relocate from his family home in Yorkshire.
Viduka could be available for around £5m and the Teessiders are believed to be looking at making a quick deal.
However, Viduka is holidaying back in Australia, meaning any deal being delayed until his return.