Arsenal midfielder Santi Cazorla has hailed the impact of Alexis Sanchez this season.

Cazorla rates Alexis the best signing of the campaign.

"He's the best signing in the Premier League," Cazorla told Sport Magazine. "There were plenty of good signings - like Diego Costa and Cesc Fabregas - but Alexis Sanchez has been huge for us.

"He's ambitious, he wants to get better with every training session, and it was positive for him to leave Barcelona. He's now playing with another mindset and he's playing fantastically."