Kimi said: "Taking part in my first FP1 is going to be really special.
"I'm really excited to drive the W15 and share the track with so many amazing drivers. I can't wait for it!"
The Mercedes Junior- who has undertaken numerous F1 tests for the team already this year as part of our Testing of Previous Cars Programme - will drive George's car for the hour-long session.
By driving in FP1, Kimi will become the first Italian to take part in a Grand Prix weekend since Antonio Giovinazzi at the 2022 United States Grand Prix.
FIA regulations state all F1 drivers must sit out one FP1 each season for somebody who has no more than two Grand Prix starts.