The 25-year-old starred at the African Cup of Nations for Nigeria.
He was also successful during his loan spell at Leganes last term.
They want to sign him permanently this summer, while Celta Vigo are also alerted to his availability.
Neither club has come close to that valuation, but Leganes are reportedly confident they can strike a deal to sign the player.
Omeruo wants to move on from Chelsea, as he knows he is unlikely to earn a first team position at the London club.