Real will host City for the first-leg of their round 16 tie on Wednesday night.
And Okdiario's chief pundit Eduardo Inda, speaking on El Chiringuito, revealed Bale will start - with Isco dropping to the bench.
He declared: "Bale will start against Manchester City. He will be (Karim) Benzema's partner up top.
"The rest of the eleven will be: Courtois; Carvajal, Varane, Ramos, Mendy; Casemiro, Valverde, Kroos, Modric; Bale and Benzema..."
It's suggested Zidane is going with Bale as he believes the Welshman always performs in big games.