Arsenal hero Martin Keown has attacked Alexis Sanchez over his pending move to Manchester United.

Arsenal had been prepared to pay Sanchez £300,000-a-week to stay at the Emirates but were unable to convince him to stay. Keown is convinced that the Chilean was swayed by finances.

"Sanchez has got to be the biggest mercenary in football," Keown wrote in the Daily Mail.

“Manchester City have wanted to sign Sanchez since the summer and, if no deal is done in January, they will be waiting for him at the end of the season.

“City would be the natural place for Sanchez to go to develop his football. He has worked with Pep Guardiola before.

Arsenal players want Alexis Sanchez saga resolved

“But for Sanchez, this is clearly not about going to the best team, working with Guardiola and taking his game to another level.

“He has probably thought that he will not get a better offer if he waits until the summer, so he might as well take the best deal on offer now. It has been all about the money."