The French international is moving in to the final year of his contract and manager Arsene Wenger is reluctant to lost the 23-year old for nothing next Summer.
Nasri moved to Arsenal from Marseille for £15 million in the Summer of 2008 and has enjoyed a fine season scoring 10 league goals and making the PFA Team of the Year. Arsenal are reported to have offered the player a new five-year, £90,000 a week deal but Nasri feels his chances of winning titles might be increased elsewhere.
Manchester United manager Sir Alex Ferguson is rumoured to see Nasri as a potential replacement for Ryan Giggs and he could be the first player to move between the two clubs since Mikael Silvestre in August 2008.
Nasri would command a fee or around £10 million but Wenger would be reluctant to sell him to bitter rivals United, particularly amid reported interest from Real Madrid. The Frenchman could be one of several high-profile departures from Arsenal with the likes of Cesc Fabregas, Andrey Arshavin and Gael Clichy all linked with moves away from the club.