LONDON - Sergi Roberto had been sent off at the end of the first period after Luis Suarez opened the scoring in a pulsating, and highly controversial, Clasico.
But Ronaldo’s injury will be the key talking point, with the Portugese now facing a fight to recover in time for the Champions League final against Liverpool on May 26.
“How long he will need I cannot tell you but for him, it is a small problem,” Zidane said afterwards. “We’ll see tomorrow after the tests, what we have to do is see the damage done to the ankle.
He is a little worried because his ankle is a bit swollen but he said it was only minor.”
Ronaldo’s injury, coupled with Barcelona avoiding defeat despite playing half the contest with 10 men, meant it was the Catalans who left the more satisfied.
Ernesto Valverde’s men are now three matches away from becoming the first ever team to finish a 38-match La Liga season unbeaten.
“It would have hurt to lose to Madrid, or any other team,” Valverde said.
“I think we are the only unbeaten team in Europe in the big leagues and that is something that pushes us.”
Bale’s goal was his 15th in 24 games this year and the Welshman will hope it sparks a return to favour ahead of Real’s European climax in Kiev.
Will give everything to stay unbeaten, says Barca’s Digne
But Bale was lucky still to be on the pitch after he stabbed his studs into the back of Samuel Umtiti’s calf, moments before Sergi was sent off.
It was one of a number of questionable decisions from referee Alejandro Jose Hernandez Hernandez, as both teams departed wondering what might have been.