The 22-year-old striker has just come to the end of a fantastic season at Stade Velodrome, notching up 17 goals and nine assists in 36 Ligue 1 appearances.
And the Belgium international has brought that form to Euro 2016, scoring in his first appearance of the tournament against Hungary on Sunday.
He’s emerged as one of West Ham’s top transfer targets for the summer and there is believed to be a £31million bid on the table that Marseille are yet to accept.
But according to The Guardian, the French club have agreed a £31.6million fee with the Hammers’ London rivals Crystal Palace.
Co-owner Steve Parish is said to have made the offer to Marseille president Vincente Labrune in person and it’s understood to include bonus payments and sell-on clauses.
Alan Pardew’s side scored the second-fewest goals of any team in the Premier League last season after rock-bottom Southampton.