David de Gea's representatives are reportedly yet to answer the call from Manchester United regarding negotiations on a new contract.
The Premier League giants are believed to be desperate to keep the Spaniard, but widespread reports have claimed that Real Madrid are lurking.
The 24-year-old, who has been in impressive form for the Red Devils throughout the season, has reportedly been targeted by the Spanish giants as a future replacement for Iker Casillas.
According to The Mirror, United fear that they could lose De Gea as his camp have so far rebuffed attempts to discuss fresh terms at Old Trafford.
It has been reported that the North-West outfit are willing to offer £140,000 per week to the goalkeeper, who enters the final year of his contract next season.
