"Under joins the Ligue 1 side on an initial temporary basis until 30 June 2022," the Serie A club said, announcing a loan fee of 500,000 euros maximum based on certain factors. "The agreement also includes an obligation for Marseille to make the transfer permanent based on the fulfilment of certain requirements."

A transfer fee of 8.4 million euros has been set with the Italian club receiving 20 percent of any subsequent moves the player makes. The 23-year-old arrived in Italy from Istanbul Basaksehir in 2017 and has scored 17 goals in 88 appearances. He spent the 2020-21 season on loan with Premier League side Leicester City.