"I've admired Mateus for a long time because he combines quality on the ball with the intensity and intelligence that are so important in the way we want to play," De Zerbi said.
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The manager emphasized Fernandes' Premier League experience despite his age.
"Despite his age, he already has good experience in the Premier League and has shown quality and consistency at this level," De Zerbi noted.
De Zerbi elaborated on Fernandes' technical capabilities and resilience.
"Mateus is comfortable under pressure, can progress the ball, works hard for the team and has the courage to make things happen in difficult moments," he remarked.
The head coach concluded that the club provides an ideal setting for the midfielder's growth.
"I believe this is the ideal environment for him to continue his development," De Zerbi said.
Sporting Director Johan Lange welcomed the addition. "I'm delighted to welcome Mateus to the Club," Lange stated.
He highlighted Fernandes' technical ability and maturity, noting he has shown he can perform consistently in demanding environments.
"We believe this is the right place for Mateus to take the next step in his career, working with our outstanding coaching staff and alongside an ambitious and talented group of players," Lange explained.
The director expressed confidence that supporters would appreciate the new signing.
"I know our supporters will enjoy watching him, as he has the talent, mentality and work ethic to become a very important player both for the present and the future of Tottenham Hotspur," Lange added.
Fernandes' arrival follows the signings of Martin Dubravka, Marcos Senesi, Andy Robertson, and Jan Paul van Hecke.
Tottenham is undergoing a major squad revamp after a 17th-place finish last season.
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Additionally, Tottenham has agreed a £100 million fee with Newcastle United to sign Italian midfielder Sandro Tonali, further expanding their summer transfer business.