George Russell has now revealed what he has ‘heard’ from Mercedes about Andrea Kimi Antonelli ahead of the Italian’s second private test in the Silver Arrows’ F1 car. The Brackley outfit have begun putting Antonelli through a testing programme to get the 17-year-old up to speed. Mercedes want to see how ready their academy talent is for a possible graduation to Formula 1 ahead of Lewis Hamilton leaving the team at the end of the season. Antonelli enjoyed his first outing in modern F1 machinery in April with a two-day test driving the 2021 Mercedes, the W12, at the Red Bull Ring. He will also g…