Rebrasse, 27, claimed the EU version of the title in his previous victory over Andrea Di Luisa in November and comes into the challenge with two defeats from 24 contests, two of which were drawn.
33 year-old Ndiaye was all set to face Groves on March 16 for the blue belt until the Londoner made his shock switch to Matchroom and the Senegal-born Italian will warm up for the clash against Rebrasse on Saturday night.
Ndiaye is not wasting his training time for Groves by awaiting a date for the Rebrasse bout and will tackle Latvian journeyman Ruslans Pojonisevs, 29, over six rounds in Veneto, Italy on the undercard of Devis Boschiero v Samir Kasmi.
OPI 2000 claimed the purse bid for the contest and will make an announcement in due course on the venue.
