"[14] On 2 September 2013, Juventus confirmed via their official website that Berardi had joined the club on a co-ownership basis that saw Luca Marrone transfer in the opposite direction, both for a fee of €4.5 million.

[11] In July 2014, Berardi's agent confirmed that he would remain on loan at Sassuolo for another season;[26] the co-ownership deal was also renewed on 20 June 2014.

[42] In the first leg of the Europa League play-offs, on 18 August, Berardi scored a goal and set up another in a 3–0 home win over Red Star Belgrade.

[45] On 28 August, he continued his goalscoring run, netting a goal in a 2–1 home win over Pescara, becoming the youngest Italian player since the 1994–95 season to score 40 goals in Serie A, and the second youngest player overall, behind Alexandre Pato, at the age of 22 years and 27 days; he later suffered an injury during the match,[46][47] and it was later announced that he had suffered knee ligament damage, ruling him out for the rest of the calendar year.

[55] It was Berardi's best goal-scoring season in his professional career and helped Sassuolo to an 8th place finish, missing out on European competition on goal difference.

[64] Berardi was a component of the Italian under-19 national team, but did not answer his call-up for qualifications to the European Championship of the age group and was disqualified for nine months for violation of the code of ethics.

[67] 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.

[77][78] In May 2017, Berardi was selected by Italy's senior head coach Gian Piero Ventura for the team's unofficial friendly against San Marino in Empoli on 31 May.

[79][80] He made his unofficial senior international debut in the match, captaining the squad, and starting in Italy's eventual 8–0 win, setting up Gianluca Lapadula's second goal.

[81][82][83] Berardi made his official senior international debut for Italy under Roberto Mancini, starting in a 3–1 friendly loss to France in Nice on 1 June 2018.

[88] In the following group match on 16 June, he set up Manuel Locatelli for Italy's opening goal in an eventual 3–0 win over Switzerland.

[90] On 10 October, Berardi scored the match–winning goal from a penalty in a 2–1 home victory over Belgium in the bronze medal match of the 2020–21 UEFA Nations League.

A quick, tenacious, technically gifted and hardworking left-footed forward, with an eye for goal, Berardi is capable of being deployed in several offensive positions across the pitch.

He has been utilised as a striker and as a supporting forward, although his preferred position is on the right wing, which allows him to cut into the centre and shoot on goal with his stronger left foot, or link up with teammates to create goalscoring opportunities for other players.

[31][93][94][95][96][97] Berardi has also been praised for his movement, positional sense, and work-rate off the ball, as well as his determination, maturity, tactical intelligence, decision making, and composure, despite his young age; however, he has also drawn criticism at times for his behaviour, lack of discipline, and a tendency to pick up unnecessary cards.

[101][102][103] In 2014, former AC Milan and Italy manager Arrigo Sacchi described Berardi as "a player of great talent, a modern footballer who constantly plays with and for the team all over the field.

"[93][104][98] In 2015, 1982 FIFA World Cup winner Giancarlo Antognoni described Berardi as "...the young [Roberto] Baggio of this generation" who "mixes creativity with strength.

[106] In 2017, he revealed that Inter Milan was his favorite childhood team, also describing Ronaldo and Diego Milito as his biggest footballing idols at the time.