  We discuss the role of $c \bar c g$-Fock states in the diffractive
photoproduction of $J/\psi$-mesons. We build on our earlier description of the
process in the color-dipole approach, where we took into account the
rescattering of $c \bar c$ pairs using a Glauber-Gribov form of the
dipole-nucleus amplitude. We compare the results of our calculations to recent
data on the photoproduction of $J/\psi$ by the ALICE and LHCb collaborations.
