Two of the favourites for the competition meet in Kazan on Friday evening, and Meunier has recently suggested that he may struggle to handle the threat offered by his Paris Saint-Germain teammate.
However, Martinez has indicated that he has faith in the right wing-back after he nullified Neymar during a Champions League fixture when the attacker played for Barcelona.
Martinez told Goal.com: "It was one of the best defensive performances that Thomas Meunier has had and probably one of the best performances against Neymar.
"On that day, Paris Saint-Germain against Barcelona, it was a 4-0 defeat for Barcelona where Thomas Meunier defended Neymar's area really well, but then he went forward and assisted the fourth goal and it was a complete performance."
Meunier has contributed two assists in his three outings in Russia.