Gareth Bale is currently in the middle of his fourth season at Real Madrid.
During his time at the club he has been a big hit, winning the Champions League twice.
Madrid are aiming to become the first club to retain the Champions League, and take on Bayern Munich for a place in the semi-finals on Wednesday (7.45pm).
They go up against old boss Ancelotti, who was sacked in 2015 after failing to win a trophy that season – even though he had steered the Bernabeu club to their 10th European Cup just 12 months earlier.
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Gareth Bale has heaped praise on old boss Carlo Ancelotti
The Bayern boss was the man in charge when Bale arrived, splashing out £86million to bring the Wales international to the Bernabeu from Tottenham.
And the forward has nothing but praise for his old manager.
“He had a relaxed playing style and was very easy to play under; a very laid-back manager,” he told the Telegraph.
Bale also praised the staff at Real Madrid for how they make sure the players are well-rested for such high-profile clashes.
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Carlo Ancelotti signed Gareth Bale during his time at Real Madrid
“The staff at Real Madrid are meticulous,” he added.
“There are smaller details like sleep that they have stressed are incredibly important.
"I have always been brought up with the idea that sleep is the best form of recovery. I’ve spoken to a sleep expert and they have told me to always try to go to bed and wake up at a similar time every night and morning.
"Getting this consistency becomes difficult when you’re flying back from away night matches like the game in Munich."