And when asked on Twitter if he knows which squad number he'll be handed next season, the 22-year-old, who wore the No 22 shirt at Marseille, replied: "Yes its 23 bro."
Batshuayi scored 23 goals for Marseille last season to earn a a Stamford Bridge switch, having also attracted interest from Premier League rivals Crystal Palace and West Ham.
He said on his move: "I am delighted to sign for one of the biggest clubs in Europe and embark on the next chapter in my career. I hope I can help Chelsea win many trophies during my time at Stamford Bridge.
Michy Batshuayi to wear the No 23 shirt at Chelsea
"Eden Hazard and Thibaut Courtois have told me many good things about the club, and with Antonio Conte coming in it's an exciting time to become a Chelsea player.
"This is a fantastic opportunity for myself and my family, I am looking forward to playing in the Premier League next season."
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