Extrapolated SFR luminosity function of star-forming galaxies in the Virgo cluster periphery (green filled dots, green dot-dashed line) and in subcluster A (black open squares, black dot-dashed line) derived from the GUViCS NUV luminosity function (Boselli et al. 2016c) are compared to those derived for field galaxies by Gunawardhana et al. (2013) for the GAMA (grey dotted line) and SDSS (grey long dashed line) samples. VESTIGE will extend by two orders of magnitude any other SFR luminosity function available in the literature, sampling SFR as low as ≃10⁻⁵ M_⊙ yr⁻¹. The estimated total number of star-forming systems VESTIGE will detect will be about 500.