Speaking to the media after the 2-0 win over Chelsea, Guardiola said: "He has the numbers for Messi and Cristiano Ronaldo, who controlled the last decade, 15 years, absolutely everything. In terms of numbers, it is that level. So, I don't know how he does it, but in 100 games scoring 91 goals is something in the Premier League, in this country, is unbelievable."
The City boss added: "I had a feeling that he feels better than last season at this stage. After travel last season, he felt a bit 'mmm-mmm' [so-so] or felt he was tired. This season, I think for the Euros unfortunately Norway was not there, there was more rest and yeah, he feels good.
"The goal was magnificent. His contribution is in many things. He had two or three chances and always I had the feeling there is a gap to improve as a football player."