On 10 August 2018, Rebić signed a new contract to last until June 2022. He had been tracked by clubs including Manchester United, Tottenham Hotspur, Bayern Munich and Sevilla, and Eintracht had lost several of their star players in addition to Kovač, who joined Bayern. Two days later, Eintracht lost the 2018 DFL-Supercup at home to precisely that team, with Rebić a 64th-minute substitute.