Madrid saw off Real Sociedad 3-0 thanks to goals from Mateo Kovacic, Cristiano Ronaldo and Alvaro Morata to open up a four-point lead on Barcelona and Sevilla and with a game in hand over their title rivals to come.
Bale has been out since suffering ankle ligament damage in November and is not expected to return before March.
However, Zidane is hopeful of having Luka Modric and James Rodriguez back for Real's next outing at Celta Vigo at the weekend.
Bale is expected to miss Real's Champions League last 16, first leg clash with Napoli on February 15 with the Welshman possibly making a return in time for the return leg on March 7.
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Madrid had begun to miss the Welshman's presence as they won just one of their five previous games before Sociedad's visit.
"It is what it is. We can't think about the Cup any more because we are out," he added.
"We would have preferred to still be in it, but we have to think positively and we are going to have a full week to prepare first for La Liga and then the Champions League."
Madrid enjoyed a dream weekend as all of their title rivals slipped up.
"It gives you more motivation when you see your rivals slip up," added Zidane. "It gives you even more desire to do well. We were watching the games all day. The most important thing, though, is what we do and we can be happy with our performance. We got three goals and three more points.
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