 On 28 January 2016, Erasmus signed for Ligue 1 club Rennes on a two-and-a-half-year deal.He made his debut for the club on 13 March, coming on as an 80th-minute substitute for Pedro Henrique in a 2-2 draw with Lyon.His only other appearance for the season came on the final day of the campaign in a 2-1 loss to Bastia which saw Rennes end eighth in Ligue 1.