The future of Partizan Belgrade whizkid Andrija Zivkovic remains up in the air.

Zivkovic's agent has this week confirmed the interest of Chelsea and Valencia in the Serb.

The U20 World Cup winner is said to have agreed a five-year pre-contract with Benfica, but fresh doubt has emerged over the deal.

Indeed, Zivkovic dropped a big hint about his plans after 'unfollowing' Benfica on his Twitter account.

The attacking midfielder is a major target for Chelsea chief Michael Emenalo and is represented by the London-based super agent Pini Zahavi.