The Argentine was provisionally suspended by Italian authorities earlier this year after he tested positive for a metabolite of clostebol, a steroid on the World Anti-Doping Agency's (WADA) banned list found in some medications.
Atalanta had previously said during investigations that they firmly believed the player's non-involvement in the affair could be proved.
Reuters has contacted the Serie A club for comment.
Palomino, who joined Atalanta from Bulgarian side Ludogorets in 2017, has made over 200 appearances for the Bergamo-based club in all competitions.
