Arsenal will demand a premium from Manchester United to sell them Robin van Persie. The Mirror says Sir Alex Ferguson has been warned it will take an "unbelievable" offer to persuade Arsenal to sell Robin van Persie to him.

Gunners manager Arsene Wenger will not sell for less than £20m - and will demand a premium fee of more than £25m from Fergie and Manchester United because Arsenal do not want to do business with a direct Premier League rival.

Van Persie trained with his team-mates at Arsenal's pre-season camp in Germany on Wednesday night, ahead of their away friendly against Cologne on Sunday, and the club insist nothing has been agreed with United.