According to RMC Sport, OM will pay around €10m for the 18-year-old, who will pen a five-year deal.
Luis Henrique will arrive in Marseille on Wednesday night to undergo his medical.
Sources close to Botafogo told RMC that he has already said farewell to his teammates.
Andre Villas-Boas has been in search of an additional forward for his squad.
The Marseille boss confirmed a new signing was in place following OM’s 1-1 draw with Lille on Sunday night.
Luis Henrique has made nine appearances for the Botafogo first team.
Marseille have officially announced the signing of Luis Henrique from Botafogo.
Henrique will wear the number 11 shirt at OM.
Nova nota na partitura do Olympique 🎶🇧🇷
Bienvenue 𝐋𝐮𝐢𝐬 𝐇𝐞𝐧𝐫𝐢𝐪𝐮𝐞 💙
— Olympique de Marseille (@OM_Officiel) September 25, 2020