By Nathan Ridley Pep Guardiola claims Cole Palmer begged to leave Manchester City, giving the Premier League champions no option but to sell their “exceptional” academy product. Palmer, 21, joined rivals Chelsea in a £42.5million transfer deal back in September and despite the Blues enduring a difficult season, he’s been revelation. The attacking midfielder has racked up 23 goals and 13 assists across 38 games for Mauricio Pochettino’s side, who return to Wembley for the second time in two months for an FA Cup semi-final clash with City on Saturday. After sensationally netting four goals in Ch…