PSG are nervous about Manchester United's interest in Marco Verratti.

United boss Sir Alex Ferguson posted a scout to see Verratti in action against Olympique Marseille on Sunday.

The Italian's agent has confirmed Ferguson's interest and PSG are now moving to upgrade the youngster's contract.

The midfielder will be offered a €1 million-a-year increase on his €1.5 million salary with the deal running to 2017.