In April 2019, it was announced that Sorrentino's contract would not be renewed, meaning that he would be leaving after eight seasons in total. He did not appear in any of the final matches, however, as he was left out of the squad once their top-tier relegation had been sealed mathematically, and posted on Twitter before the final fixture: "I would have liked to wear these gloves tomorrow. To say goodbye to the fans, my teammates. 271 appearances with this shirt. I would've imagined a different ending. An ending with the 'Eyes of the Tiger.' But beyond the players, there is the shirt. For this I will always say: THANK YOU, CHIEVO!" In total, he collected 271 appearances with the club in all competitions, with his final appearance coming in a 3–1 home loss to S.S.C. Napoli on 14 April, a result which sealed the team's fate. Ahead of their final fixture of the campaign, where they finished last, he posted on Twitter: "I wish to whoever will take my place, to whoever will take my locker, to whoever will wear the Chievo shirt after me, to sweat, struggle, and fight. Always with the eyes of the tiger. Because I will always carry this shirt and this changing room in my heart. Thank you to everyone." However, he also later announced that he would not be retiring from football, and that he would still continue to play and look for a new team after becoming a free agent, in hope of playing his 400th Serie A match.