  The competition among spin glass (SG), ferromagnetism and Kondo effect has
been analysed in a Kondo lattice model where the inter-site coupling $J_{ij}$
between the localized magnetic moments is given by a generalized Mattis model
\cite{Mattis} which represents an interpolation between ferromagnetism and a
highly disordered spin glass. Functional integral techniques with of Grassmann
fields has been used to obtain the partition function. The static approximation
and the replica symmetric ansatz has also been used. The solution of the
problem is presented as a phase diagram temperature $T$ {\it versus} $J_K$ (the
strength of the intra-site interaction). If $J_K$ is small, for decreasing
temperature there is a second order transition from a paramagnetic to a spin
glass phase For lower temperatures, a first order transition appears where
solutions for the spin glass order parameter and the local magnetizations are
simultaneously non zero. For very low temperatures, the local magnetizations
becomes thermodinamically stables. For high $J_K$, the Kondo state is
dominating. These results could be helpful to clarify the experimental
situation of $CeNi_{1-x}Cu_{x}$.
