By Alan Smith Rio Ferdinand believes Manchester City will earn a higher level of praise for their achievements when Pep Guardiola leaves as manager. And the former England centre back says the “ridiculous standard” set by the reigning Premier League champions in recent years has meant no one is surprised by their ongoing success and there is a risk the average punter could become bored – just like when he was marshalling United’s defence 15 years ago. Speaking in his role as a pundit on TNT Sports before City hosted Everton in Saturday’s early kick off, Ferdinand said: “When their period comes…