The 25-year-old defender has played for PAOK of Salonika in Greece for the last six seasons, spending a short period on loan to West Bromwich Albion three years ago.
But the Nigerian international is also being eyed by Sheffield United and has already rejected a move to top Greek outfit AEK Athens in order to pursue a return to English football.
His agent Sam Stapleton confirmed that the Whites and the Blades were the front-runners to get the player.