The present invention relates to heterocyclyl-pyrimidinyl-amino derivatives of formula (I) heterocyclyl-pyrimidinyl-amino derivatives of formula (I) wherein Het, Y, p, Ra, Rb, Rc, X, n, L1 and L2 represent various substituents, their process of preparation, preparation intermediate compounds, their use as fungicide active agents, particularly in the form of fungicide compositions, and methods for the control of phytopathogenic fungi, notably of plants, using these compounds or compositions.