Madrid have not officially confirmed any new injury for Bale, but Zidane admitted at a news conference there was a problem, with the Wales global having not taken part in group training since the club's return from Germany and missing Saturday's session along with the injured Marcelo, Mateo Kovacic, Theo Hernandez and Karim Benzema.
"I think that he's fine", Zidane said at a press conference prior to Sunday's La Liga home match against Espanyol.
"We want to keep doing what we've been doing and to win well", he said. "It's true we dropped points in La Liga, but tomorrow we have a chance to change things".
"I am happy that he [Marco Asensio] has renewed".
The 28-year-old is in the Wales squad for their upcoming World Cup qualifiers against Georgia in Tblisi and then the Republic of Ireland in Cardiff on Monday, 9 October.
The big team news for Real Madrid was that there was a La Liga debut for 18-year-old Moroccan worldwide Achraf Hakimi, who was handed a start due to the absences of Dani Carvajal and Marcelo at the back.
TALKING POINT - Was this the start of Real Madrid's recovery?
Despite Real Madrid's relatively rocky start, Bale has started the season in good form, scoring against Real Sociedad recently and also against Borussia Dortmund. It might not be the most comfortable of games, but Madrid might finally pull through.
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