He also missed games against former club Tottenham in this year's Champions League group stages.
The Champions League winners did progress to the quarter-finals of the Copa del Rey with a 5-2 victory on aggregate but a draw at home against a second division side didn't serve to silence the critics.
"We'll try to work hard and fight so we can win our next game but we don't like this situation at all, it's difficult because the more games you draw or lose the more pressure you are under".
Sport report that Madrid president Florentino Perez has already chose to call time on Zidane's reign at the end of the campaign and has held talks with the 45-year-old's replacement.
When Formentera began their long journey by boat, plane and coach to the Basque Country for Wednesday night's last-16 Copa del Rey second leg against Alaves, they knew it was likely to be their last in this season's competition.
Zidane, who was named French coach of the year for 2017 by France Football magazine after leading Madrid to a record five trophies in the last 12 months, held a meeting with his squad on Tuesday that delayed the start of his pre-game press conference.
Denis Doyle GettyImages
That is due to a complication that was found during his medical last Thursday, and Real's doctors have ascertained that the injury could rule the goalkeeper out of action until March.
"I believe in what we are doing, and my players", Zidane said. "In June if there are changes, and we sit down and talk, maybe there are positions we can sign players".
"To be very clear I do not want any [new players]". Let's see what happens at the end of the season.
"I'm not going to point fingers at one or two people", he said.
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"We're not going to talk about the league every weekend, if we lose points we can not be successful".
Numancia are also likely to field a weakened eleven, with the visitors having Pape Diamanka suspended after his sending off in the first leg.