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. Berardi remained with Sassuolo on a season-long loan deal for the 2013–14 season. He made his Serie A debut at the age of 19, in a 1–1 away draw against Napoli, on 25 September 2013. He scored his first Serie A goal from a penalty on 6 October 2013, in a 3–1 defeat to Parma. On 20 October, he scored a penalty as Sassuolo defeated Bologna 2–1 for their first Serie A win, moving them off bottom spot. He scored a hat-trick, including two penalties, in Sassuolo's first ever Serie A away win, 4–3 against Sampdoria on 3 November 2013.