City are preparing to face Lyon in Lisbon this week.
Bernardo said, “I think there is no secret: Pep Guardiola is one of the best managers in the world," he continued.
“To me, it's been a privilege and a pleasure to work under his tutelage every day for the last three years.
“I have learnt a lot with him. I had to adapt to his style of play but it's been an absolute pleasure.
“The number of trophies we won in the last three seasons shows how successful it has been during his time here. I'm very proud to be part of his team."