Chelsea and Manchester United have been warned off River Plate sensation Lucas Ocampos.

The 17 year-old has been likened to Real Madrid star Cristiano Ronaldo and Ole says Chelsea hope to gain a jump on United by offering €17 million for Ocampos in January.

But River president Daniel Passarella insists they won't sell the youngster while in the Argentine Second Division.

"We will not give up anyone, not even Ocampos, until we return to the top flight," said Passarella.