We discuss in what way flavour symmetry breaking through nondegenerate light quark masses and through the mixing of &pgr;0, &eegr;, &eegr;’modifies the Goldberger‐Treiman relations for the triplet, octet and in particular, for the generalizations to the flavour singlet channel. We derive simple new algebraic expressions for the &pgr;0–&eegr; and &pgr;0–&eegr;’mixing and show that the seemingly large isospin and flavour breaking which result from nondegenerate quark masses are to lowest order cancelled by the &pgr;0–&eegr;–&eegr;’mixing.