  Ultra Steep Spectrum (USS) radio sources are one of the efficient tracers of
High Redshift Radio Galaxies (HzRGs). To search for HzRGs candidates, we
investigate properties of a large sample of faint USS sources derived from our
deep 325 MHz GMRT observations combined with 1.4 GHz VLA data on the two
subfields (i.e., VLA-VIMOS VLT Deep Survey (VVDS) and Subaru X-ray Deep Field
(SXDF)) in the XMM-LSS field. The available redshift estimates show that
majority of our USS sample sources are at higher redshifts with the median
redshifts ~ 1.18 and ~ 1.57 in the VLA-VVDS and SXDF fields. In the VLA-VVDS
field, ~ 20% of USS sources lack the redshift estimates as well as the
detection in the deep optical, IR surveys, and thus these sources may be
considered as potential high-z candidates. The radio luminosity distributions
suggest that a substantial fraction (~ 40%) of our USS sample sources are
radio-loud sources, distributed over redshifts ~ 0.5 to 4.
