  The detection of anomalies in gravitational microlensing events is nowadays
one of the main goals among the microlensing community. In the case of
single-lens events, these anomalies can be caused by the finite source effects,
that is when the source disk size is not negligible, and by the Earth rotation
around the Sun (the so-called parallax effect). The finite source and parallax
effects may help to define the mass of the lens, uniquely. Free-floating
planets (FFPs) are extremely dim objects, and gravitational microlensing
provides at present the exclusive method to investigate these bodies. In this
work, making use of a synthetic population algorithm, we study the possibility
of detecting the finite source and parallax effects in simulated microlensing
events caused by FFPs towards the Galactic bulge, taking into consideration the
capabilities of the space-based Euclid telescope. We find a significant
efficiency for detecting the parallax effect in microlensing events with
detectable finite source effect, that turns out to be about 51% for mass
function index .
