“I’m incredibly proud to be doing the FP1 session in Mexico City with the Team – it’s a dream come true,” he said.
“To think in less than two months that I’ll be doing my first official Formula 1 session with Mercedes, who have won eight consecutive Constructors’ Championships, is amazing.
“This has been my dream since I was very young and something I’ve been fighting for through my whole junior career.
“It’s taken a lot of hard work, and this is a very important step for me on my journey. To be able to develop myself in an F1 car alongside some of the best drivers in the world is something I’m looking forward to.
“I want to thank Mercedes for this incredible opportunity, as well as my sponsors and manager for always believing in me. I can’t wait to be driving W14 for the first time.”
Vesti currently races in the FIA Formula 2 Championship, and was leading the Drivers’ standings up until the most recent round at Spa-Francorchamps.
With three rounds remaining in the season, Vesti sits 12 points down on Theo Pourchaire as the fight for the title heats up.
Mercedes team boss and CEO Toto Wolff added: “Fred has executed an impressive Formula 2 campaign so far this season.
“Driving in an FP1 session is the next step in his development and we’re looking forward to giving him that opportunity.
“He is a talented young driver, not only quick but thoughtful, and he understands exactly what the Team is looking for from him in the car. I am sure he will perform well and provide a solid starting point for our work over the weekend.”