Francisco "Isco" Alarcon, who had been sidelined by former coach Santiago Solari, and Gareth Bale, a reserve before Zidane's return, scored to help Madrid end its four-game losing streak at home and recover some pride.
De Gea had always been linked with a move to the Santiago Bernabeu, but Real instead opted to sign Courtois from Chelsea in a £35m move last summer.
Bale, whose relationship with Zidane deteriorated to breaking point last season, was arguably the biggest victor, his performance proving there could yet be a place for him in what the club's president Florentino Perez has dubbed "the glorious new era". Zidane lost faith in Bale last season, with the pair's relationship growing increasingly strained before Zidane announced his departure.
In a separate report on the BBC from Spanish football journalist Guillem Balague, Tottenham chairman Daniel Levy offered to sign Bale on a one-year loan move, but having not offered to take enough of Bale's massive salary on-board, the offer never officially made its way to Real Madrid.
During Santiago Solari's time as the Real Madrid boss, the Whites had some dismal results and that was probably because of the clueless manager that sat in the dugout, and his judgement of players based on their physical appearances at training.
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Although the Welshman's future seems away from Madrid, Zidane threw him in from the start against Celta Vigo and reaped the rewards.
And, the next player on Zidane's wish list is Manchester United superstar De Gea.
Zidane's frustrations with Bale began due to Bale's extensive injuries, especially when he tried to rush back from them too soon, according to Spanish publication AS.
"It's not easy - I don't know if it's easy either - when you're in the media or when you're a supporter, you can think short-term".
And the Spaniard duly repaid the manager's faith in scoring the first goal of the second Zidane era, tapping in from Karim Benzema's cross, while an impressive display also saw the 26-year-old make three key passes with an overall accuracy of 97.2 per cent from 36 passes. "There are of course those who are sometimes going to be left out, who are not going to play". The second half was a big improvement.
"There will be changes, but I will not be looking at these games if everyone does well.to see if they stay or leave", Zidane said.