Lionel Messi gave Barca, who were recently crowned La Liga champions, a 2-1 lead in the 52nd minute after Cristiano Ronaldo's first-half strike cancelled out Luis Suarez's opener.
After being shown by television cameras wincing and limping, he was then taken off for Marco Asensio at the break.
"They'll come with the idea of ending our unbeaten streak and hopefully it'll be a good game".
"How long he will need I can not tell you but for him, it is a small problem", Zidane said afterwards.
Bale had risked getting sent off for raking his studs against Samuel Umtiti's leg but escaped without a booking on that occasion and Roberto was sent off moments later for hitting Marcelo following an off-the-ball tussle.
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They seemed to benefit from being back at home and looked to be the more comfortable team shooting from the outset. And if they're making shots, they become risky . "That's his game", Rondo said of Green. "It starts with defense".
"In the end it is a draw, and in the end it looks like Barca will end the season unbeaten", Zidane said. "But a draw also isn't a bad result for us given how the game went".
Gerard Pique stepped on his ankle as he unsuccessfully tried to stop the Madrid forward from scoring from close range.
There is no room in the matchday squad for the likes of Yerry Mina, Aleix Vidal and Andre Gomes, who are all left out by Valverde for Sunday's match.
Barca had Sergi Roberto sent off in first-half stoppage-time following a clash with Marcelo, but regained the lead through Lionel Messi seven minutes after the interval.
Champions Barca have 87 points while Real are third in the Liga standings with 72 after 35 games. "We both went out to play well and win".
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However, Gareth Bale saved the day for Mardid as his first ever Clasico goal made the tie end even at 2-2.
The tension began to rise as Alba and Modric squared up, so did Suárez and Sergio Ramos, before Messi was booked for a foul on the Madrid captain.
Zidane says, "The most important thing is respecting what Barcelona has done, winning the league".
Alaves routed Malaga 3-0, and Getafe beat Las Palmas 1-0.
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