The 24-year-old became the world's most expensive player when he moved from Tottenham to the Bernabeu for £86million this summer, but has not featured for Los Blancos since the 1-0 home loss against Atletico Madrid last month.
However, the 54-year-old coach boss says that the Welsh attacker has fully recovered from his muscular problems.
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"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.