  We explored the impact of the synergy between the Euclid near-infrared
photometric surveys and the SKA radio continuum surveys on the studies of the
cosmic star formation. The Euclid satellite is expected to perform a Wide and
Deep photometric surveys to an infrared limit of H ~ 24 and H ~ 26 respectively
and a spectroscopy survey with a flux limit of $\sim 3 \times 10^{-16}$ erg
cm$^{-2}$ s$^{-1}$ in the Halpha line. Combining the H band Euclid selected
samples with the ground based ancillary data (fundamental for the SFR
estimation) we will be able to detect the star forming galaxies down to SFRs of
order of unit to z ~ 2 and down to SFR ~ 10 to z ~ 3, sampling the majority of
the star forming galaxies up to z ~3 and beyond and placing definitive
constraints on the star formation history of the universe at z<4-5 (is there a
peak a z ~2 or a plateau at 1 <z <5 ?) and on the galaxies evolution models.
The only tools able to provide a accurate dust-free calculation of their SFR
are the SKA continuum surveys.
  The observational parameters of the Deep Tier SKA1 reference survey (a 0.2-
0.5 arcsec resolution and a 5 sigma detection limit of 1 microJy over 30 deg2
at Band 1/2 ) are the perfect complement of the Euclid survey. We showed, in
fact, that with this kind of SKA survey we will be able to determine a dust
unbiased SFR for a huge fraction (~85 %) of the Euclid SFG providing strong
constraints on the star formation history of the Universe.
