Zamalek chief Tarek Hashish admits Galatarasay have a permanent option for Mostafa Mohamed.
The striker, outstanding so far with Gala, is on-loan in Turkey to the end of this year. His form has attracted rival interest from Crystal Palace.
Hashish also stated that in case of the permanent transfer of Mohamed to Galatasaray, 15% of the next sale will be paid to Zamalek.
Galatasaray hired the 23-year-old young striker for $2m for a year and a half.