  We present predictions for the exclusive photoproduction of $\Phi$-meson on
Proton at large tranfer, where we use a quark-diquark structure model for the
proton. Extrapolation from our results to lower tranfers is comparable in
magnitude with available data in that range. This may support the diquark model
in its ability to provide, for that process, an appropriate link between
diffractive physics at low transfer and the standard semi-perturbative approach
of hard exclusive processes at very large tranfer, where the proton recovers
its three-quark structure.
