Koeman believes Pep Guardiola created the greatest ever Barcelona team during his four years as manager at the Camp Nou.
“When he was the manager at Barcelona, I saw the best Barcelona team ever in every aspect of football,” he told a news conference.
“Of course, the standard in Barcelona was, and always is, high. But he made it 200 percent higher in every aspect of football and I know the people form Holland they really enjoyed watching Barcelona and Bayern Munich because it’s a different way of football.
“We like football and we like to see a team who plays attractive football. We like to see a team that dominates and sometimes it’s risky what they try to do.
“That’s football that I like and, of course, everything is about winning, in the weekend. But that’s the most difficult way he’s doing it as a manager and finally if you win titles then bravo!”
Koeman also has been impressed by the impact that Guardiola has already had at the Etihad, winning his first 10 games in charge.
“I watched City against Gladbach in the Champions League at home live and it’s very good to see the difference between the way [they] play this season and how they played last season and that’s difficult for defending.”