Goals from Tom Dele - Bashiru , Sadou Diallo and Lukas Nmecha saw City safely into a fifth round tie with Southampton .
Carsley insisted City was the City of his team that made the difference .
Goals from Tom Dele - Bashiru , Sadou Diallo and Lukas Nmecha saw City safely into a fifth round tie with Southampton and Carsley insisted it was the focus of his team that made the difference .