Pep Guardiola might need to break his golden Man City transfer rule this summer

Manchester City are embarking on a new chapter after their historic treble under Pep Guardiola.

City have reached football utopia after adding their fifth Premier League title in six years, the FA Cup and the Champions League to their collection. Guardiola and City finally have the monkey off their back after years of pursuing European glory.

The challenge for City now is to remain hungry. That may sound simple but only a few months ago, Guardiola felt his players had lost their appetite for success.

After achieving such a feat, there could be churn in the City squad this summer. Several high-profile players could be on the move as Guardiola bids to freshen things up.

READ MORE: Riyad Mahrez responds to Man City transfer exit reports

Aymeric Laporte, Ilkay Gundogan, Riyad Mahrez and Bernardo Silva have all been the subject of speculation for various reasons. Guardiola has always insisted he would never keep a player against their will, should there be a suitable offer on the table.

That has been evidenced by the exits of Leroy Sane, Ferran Torres, Raheem Sterling and Joao Cancelo. All, perhaps bar the latter, left the club of their own volition rather than City's.

In the case of Cancelo, it was a huge gamble to let him leave. Left-back has been a problem position throughout the Guardiola era and the shift in tactics came at a critical period of the season.

City have managed to cover that role using Nathan Ake, Manuel Akanji and Bernardo, with Guardiola starting the Champions League final with four recognised centre-backs in his team. Of course, it is more nuanced than that but it's a firm shift from the City of old.

With that in mind, reports that Kyle Walker is considering his future are intriguing. The Englishman