He says working with Guardiola is already taking his game to another level.
He said: “The goals are going to come and I need to keep working hard.
“I am happy with my scoring record.
“Whenever you get a chance to play you have to take it, because you don't know when the next one will come.
“Guardiola is a great manager. Everybody knows that, and I am enjoying working with him – I think he is the best manager in the world.
“He has done it everywhere in Spain and Germany and I think he is going to do it in England as well."