Arsenal have made a £20million bid for Wayne Rooney, the Mirror reports.

The Gunners have fired the first shot in a war that is sure to spark a ­response from ­Chelsea.

Jose Mourinho has Rooney at the top of his ­Chelsea wish-list, and is ­expected to make a ­counter-bid in an effort beat Arsenal for the signature of the 27-year-old.

But senior United sources last night insisted that ­Rooney is not for sale.

New United boss David Moyes will meet Rooney this week to discuss the Arsenal bid and his future. United decide whether to sell Rooney to a Premier League rival - or hope that clubs like Paris St Germain and Monaco make a bid.

Rooney has two years left on his £250,000-a-week deal and any new offer would have to include a testimonial given that he is approaching a decade of service with the champions.

But first Rooney wants assurances from Moyes about his role in the United team.