Real meet Athletic and Kepa this weekend.
Both Keylor Navas and Kiko Casilla have enjoyed mixed spells this season but the coach's support for his Costa Rican No. 1 remains unwavering.
"I have always had the best goalkeepers, and for me Keylor is the best," Zidane asserted. "Without any doubt I will always support Keylor, Kiko and those who are at the club.
"Kepa is a very good goalkeeper, but he is not my goalkeeper."
The coach insisted that his focus is on the games before the turn of the year with Mauro Icardi another man touted for a switch to Madrid.
"We have not talked about it," claimed Zidane.
"I have not asked for anyone, first we must play our matches and, when the market opens, we will talk."