At just 20 years old, Mendoza moves to Atlético for a fee close to €16m.
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He signed and was registered at 11:55 PM, and will train with the team later today.
Mendoza has signed a contract with Atletico to 2031.
With his signing, Atlético secures one of the brightest young talents in Spanish football. A star in the U20 World Cup, Mendoza is also a first choice for Spain U21s this season.