Barcelona coach Pep Guardiola has put Arsenal and Manchester United on red alert.
Guardiola has been linked with both clubs this season.
He said: "My time here is coming to an end. I will stay one more year and that will be four years here. You have to be brave and understand when it is time to go. Players and coaches get tired of each other after a time."
Asked about working in England, he added: "I would not rule it out. I never had the chance to play there. It's not something I rule out."
