They won La Liga, the Champions League, UEFA and Spanish Super Cup in a thrilling fashion after hitting top form in a four-month spell between April and August, but since then the European champions have faded, understandably fatigued by a heavy schedule.
Madrid trail Barca by eight points at the top of La Liga and finished second to Tottenham Hotspur in their Champions League group, which proved costly as they were paired with free-spending Paris Saint-Germain in a blockbuster last 16 tie on Monday.
Until then Madrid had lacked the same killer instinct as last season with Cristiano Ronaldo and Karim Benzema scoring a combined total of just six times in La Liga, while Gareth Bale has made just one brief appearance as a substitute since September.
"We are improving in every sense," said Zidane after thrashing Sevilla. "If you play well, you will create more chances. We created plenty of chances."
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"We are preparing with plenty of desire and excitement. After a great game against Sevilla we are very motivated and our confidence is very high."
- Tactical switch -
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Real's return to form coincided with a change of tactics from Zidane as the pace of Marco Asensio and Lucas Vazquez on the wings produced an instant impact.
After missing out at the weekend, Casemiro and Isco are expected to feature on Wednesday when Real take on local side Al Jazira, who have already dealt with Oceania's Auckland City and Asian champions Urawa Red Diamonds to reach the last four.
"We don't just play as Jazira now, we play for the UAE," Al Jazira coach Ali Mabkhout told FIFA.com.
"We know Real Madrid are one of the best teams in the world and this is incentive for all the players."
The newly crowned South American champions take on Mexican side Pachuca in the other semi-final on Friday.
"Everyone thinks the game on Wednesday will be easy, but it won't," added Zidane.
"We need to think about Wednesday and doing things right to try and win this trophy once again.
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