Frederik Alves

Youth career

Due to Alves' Brazilian background, he travelled to visit some family in Brazil. Alves played with his cousins and took part in a few training matches, before he was spotted by an agent, which he made a deal with. The agent then brought 15-year old Alves to Coritiba. Alves returned to Denmark after two years in Brazil and joined Silkeborg.

Silkeborg

In the summer 2018, 19-year old Alves signed a one-year trainee-contract with Silkeborg which meant, that he was going to train with the first team but play with the U19s. On 26 September 2018, Alves got his official debut for Silkeborg in a Danish Cup game against Næstved BK, where he was among the 11 starting players. On 1 November 2018, he signed a new deal until the end of 2020. Except for the following two games, Alves played all of the remaining games for Silkeborg and helped the team promoting to the Danish Superliga which also gained him a spot on the Danish U-20 national team. On 1 June 2019, Alves signed a new contract until the summer 2024.

West Ham United

On 4 November 2020, Silkeborg announced that they had sold Alves to an unnamed club, believed to be English Premier League club West Ham United. On 22 December 2020, West Ham announced the signing of Alves for an undisclosed fee, on a three-and-a-half-year contract commencing on 2 January 2021.

Loan to Sunderland

Alves joined Sunderland on a season-long loan for the 2021–22 EFL League One season on 13 August 2021.…

Alves has described his playing style as "a defender who likes to play with the ball at my feet, but I also like defending and am good in my duels", drawing inspiration from German international defender Jérôme Boateng. The Athletic has praised Alves' versatility, owing to his ability to use both feet and being able to operate at right-back. Upon signing for Brøndby, director of football Carsten V. Jensen labelled Alves as "calm on the ball" with "great physical qualities".

As of match played 8 December 2025

Alves' mother is Brazilian, while his father is Danish. For this reason, Alves has dual citizenship although he was born and raised in Hvidovre, Denmark.