Rajkovic was brought in for the outgoing Edouard Mendy, who was on his way to Stade Rennais after a summer of heavy speculation on his future. Mendy had been hugely impressive in his first season in Ligue 1, keeping 14 clean sheets bettered only by Lyon's Anthony Lopes and Nice's Walter Benitez. In his first season in the Champagne region, Rajković will have youth academy product Nicolas Lemaitre as a backup.