Marseille have agreed a fee of around £15m to sign Watford forward Ismaila Sarr.
The 25-year-old headed to the French side's training camp in Germany on Sunday night ahead of a medical.
Sarr joined the Hornets for a club record £28.8m in 2019 and has had mixed success in his time at Vicarage Road.
He was unable to keep them in the Premier League after scoring just five goals in his first season at the club, but helped them win promotion next season by notching 13 in the Championship.
The Senegal international showed glimpses of his talent the next season as Watford again failed to stay in the top flight, but stayed at the relegated club that summer despite interest from Tottenham and Aston Villa.