Both teams will clash in a matchday two encounter at the Diego Armando Maradona Stadium.
Osimhen is rated as one of the best strikers in the world at the moment.
The Nigeria international came off the bench to score in Napolis 4-1 victory at Lecce last weekend.
Ancelotti picked the forward and winger Kvicha Kvaratskhelia as the men, who could hurt his side in the game.
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They are very good forwards who have really broken out in the last year, they have demonstrated their quality and shown they are top-level players, Ancelotti told Real Madrid official website
They have amazing talent with different characteristics. Kvaratskhelia is very strong one-on-one and Osimhen is very dangerous.
The 24-year-old bagged an assist in Napolis opening day 2-1 win against Portuguese club SC Braga.
Osimhen registered five goals for Napoli in the UEFA Champions League last season.
He has scored five times in seven league appearances this term.
Napoli were eliminated at the quarter-final stage last season by Serie A rivals AC Milan.
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