Havertz eventually moved to Chelsea before leaving for Arsenal last summer.
Real Madrid contacted Bayer in 2020 to acquire his services, but they couldn't match Bayer's 80m asking price.
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Carro recalled to Onda Cero: "We recommended Havertz wait, but he wanted to win titles.
We sold to Chelsea. One of the reasons was the ambition he had."
For Carro, Havertz is a player who, due to his football and quality, had the capacity to fit better in a Spanish club".