  Two consecutive transits of planetary companion OGLE-TR-111b were observed in
the I band. Combining these observations with data from the literature, we find
that the timing of the transits cannot be explained by a constant period, and
that the observed variations cannot be originated by the presence of a
satellite. However, a perturbing planet with the mass of the Earth in an
exterior orbit could explain the observations if the orbit of OGLE-TR-111b is
eccentric. We also show that the eccentricity needed to explain the
observations is not ruled out by the radial velocity data found in the
literature.
