The former PSG coach has insisted that the Welshman is fit enough to feature again after a spell on the sidelines due to injury
The former Tottenham star has not featured for the Santiago Bernabeu side since the 1-0 home loss against Atletico Madrid last month, but the Blancos boss says that the 24-year-old attacker has fully recovered from his muscular problems.
"Bale's available for tomorrow's game and will get playing time. It's important for him to be part of the team and to play again," Ancelotti explained on the eve of the game in the Spanish capital.
"I'm surprised about the reports about Bale's back injury. They're simply not true. He doesn't have a back problem. Just look at the last few seasons. He would not have been able to play so many games if he had a slipped disc.
"I know about disc protrusions, I had three and they never caused a problem.
"Some say I'm crazy for playing Bale against Villarreal, but I was not the first to play him. He was with Wales before that."
Bale has made three appearances for Madrid so far, scoring once in the process.