As its first of two mandatory rookie runs in Friday first practice sessions, Mercedes has handed the 21-year-old Dane a run in the team's Mercedes W14 at the Mexico City race at the end of October.
"I'm incredibly proud to be doing the FP1 session in Mexico City with the Team, it's a dream come true," Vesti reacted to the news.
"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.
"It's taken a lot of hard work, and this is a very important step for me on my journey."
Mercedes chief 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."
Source: Autosport