Berardi has played for the Italian under-21 national team. He received his first call-up on 28 February 2014, for the team's European qualifying match against Northern Ireland on 5 March. On 2 March, however, he elbowed Cristian Molinaro during Sassuolo's league fixture against Parma, and was subsequently excluded from the squad for violating the team's code of ethics. He made his debut under Italy under-21 manager Luigi Di Biagio on 4 June 2014, in a 4–0 home win over Montenegro. He scored his first goal on his third appearance for the "azzurrini", the match-winning goal in a 3–2 win over Serbia in a 2015 UEFA European Under-21 Championship qualifying match, which allowed Italy to progress to the playoffs, and eventually qualify for the final tournament, which would be held in the Czech Republic.