Gharib said that he did not make his choice on the other two over-aged players that will join the team alongside Liverpool's winger Mohamed Salah.
Egypt will send an official request to Liverpool to include Salah in Egypt’s squad in the Olympics.
Gharib’s comments came after Mostafa scored his third goal for Galatasaray in his third match with the Turkish superpower.
Egypt U-23 national team started the U-23 friendly tournament with a goalless draw against South Korea.
Ghareeb announced the team’s squad for November camp as the team will face Brazil and South Korea, as part of the preparations for Tokyo Olympic Games.
Salah was one of the U-23 team’s players who participated in 2012 Olympic Games in London.
Gharib led the national team to U-23 Africa Cup of Nations Final for the first time in the history after Egypt defeated South Africa at the semi-finals.
Over 75,000 fans will be at the stadium on Friday night which will set a new attendance record for this competition.
Egypt secured a semi-final spot as they defeated Mali and Ghana respectively to gain six points after a strong start at the competition.