Cristiano Ronaldo scored his 300th La Liga goal with a sumptuous finish against Getafe.
While the five-time Ballon d'Or victor scored two goals, it was Marco Asensio who proved to make a difference providing two assists in the space of seven minutes to take the tie away from PSG, and give his side an advantage going into the second leg.
Real had their advantage halved by Getafe's Francisco Portillo from the spot, but Ronaldo scored his brace in the 78th minute to ensure all three points.
Zidane said the midfield pair had not yet returned to training but that he hoped they would be able to train on 5 March. "In Paris on Monday and Tuesday we will have people around us so that we can calmly prepare for the game". They are important players but we have to look to Tuesday's game.
Ronaldo became the fastest player to reach 300 goals in La Liga, taking his tally to 301 in 286 matches. He nearly had a second late on but a curling shot nipped the post. We have to concentrate for 90 minutes.More news: China says it does not want a trade war with the US
But, on a night when his 117th La Liga appearance saw him pass David Beckham as the division's most capped British player, Bale delivered a timely reminder of his quality.
Zidane started with the full attacking compliment of Ronaldo, Bale, Karim Benzema and Isco, with Benzema and Ronaldo the most advanced and the other two allowed to drift.
It took until the 24th minute for the reigning champions to have a chance of note, but it ended up in the back of the net as Bale swept home from close range after the ball had fallen kindly for the Welshman off the back of Isco.
Remy tested the handling of Navas in the early stages of the second period, but the 31-year-old was sent off moments later as he picked up a second yellow card for grabbing the neck of Nacho.
PSG's top scorer Edinson Cavani guided in the third after Julian Draxler astutely headed the ball into his path with 10 minutes left.