The Nigerian international has been training with the Baggies reserves this summer after attempting to force a move to QPR on the final day of the January transfer window.
Fulham have been linked with a move for the 32-year-old while Dubai club Al Nasr had an £850,000 bid rejected, and now Cardiff are reportedly poised to make an approach.
The Bluebirds have twice broken their transfer record this summer with the signings of Andreas Cornelius and Steven Caulker, spending almost £20m.
However, manager Malky Mackay says the Premier League newcomers are hopeful of further strengthening their squad before the end of the transfer window.
"We still have three or four irons in the fire and we have until September 2nd (when the transfer window closes)," said Mackay.
"We may well start the season still chasing targets but by the end of August I hope to have the squad together than can absolutely compete."