The Blancos coach is set to pick Spain star in his Champions League starting XI against the Turkish giant.
The goalkeeper has been left out in the cold so far this season, with Ancelotti opting for Diego Lopez in all of his Liga matches so far.
However, while giving praise to Lopez for his consistent performances, the tactician has announced plans to rotate his squad ahead of the first Champions League group game this term.
"Diego played really well, but the Iker decision has been made," the 54-year-old was quoted as saying by Marca.
He went on to praise Gareth Bale's performance in the 2-2 draw against Villareal last weekend, where the Welshman was able to get himself on the score sheet.
"Bale is happy. He played well and showed a good attitude on the pitch," he said. "I don't think it was the team's worst performance this season. It was clear that the two teams were playing at different tempos. That's to be expected after the international break."
Madrid is preparing to kick off with Galatasaray on Sept. 17.