Chelsea winger Callum Hudson-Odoi admits Kai Havertz convinced him about joining Bayer Leverkusen.
Hudson-Odoi is on-loan for the season at Bayer.
"Kai had only great things to say. He said, 'I developed really well here, they pushed me on, they made me a better player, who I am today'," he told the Daily Mail.
"He was urging me to come: 'Go and develop yourself, go and be you, be free. We know what you can do.
"Just go and show it consistently'."