Nottingham Forest and Newcastle United are eyeing Estudiantes winger Benjamin Rollheiser.
Benfica are also keen, says Ole, though Estudiantes hope to delay his sale.
Rollheiser is wanted by all three clubs in January.
But Estudiantes chief Marcos Angeleri said: "It is possible to keep him for six more months, we are going to try.
"But it does not depend only on our decision and it will be what the market later demands."