  In these latest years, the detection of Wolf-Rayet (WR) stars in Giant HII
Regions (GHRs) has yielded several questions about our current understanding of
massive stars evolution and hot expanding atmospheres, the age of the ionizing
populations and their impact onto the physical properties of GHRs. Here, we
present spectrophotometric observations of 4 extragalactic GHRs which show WR
features in their spectra. Our goal is to reproduce simultaneously the observed
WR properties and the emission line spectra with the help of current
evolutionary synthesis models. Finally, we address the main advantages that GTC
will provide to our better understanding of massive star forming regions.
