We study the weak decay $Omega_b^- to (Xi_c^+ , K^-) , pi^-$, in view of the narrow $Omega_c$ states recently measured by the LHCb collaboration and later confirmed by the Belle collaboration. The $Omega_c(3050)$ and $Omega_c(3090)$ are described as meson-baryon molecular states, using an extension of the local hidden gauge approach in coupled channels. We investigate the $Xi D$, $Xi_c bar K$ and $Xi_c^prime bar K$ invariant mass distributions making predictions that could be confronted with future experiments, providing useful information that could help determine the quantum numbers and nature of these states.
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