Cornelis Henricus Johannes "Kees" de Boer (born 13 May 2000) is a Dutch professional footballer who plays as a midfielder for Italian club Salernitana.
De Boer played youth football for FC Volendam, Ajax and Swansea City. He made his professional debut for Swansea's first team in a 3âÂÂ1 home win over Northampton Town at Liberty Stadium in the EFL Cup. De Boer replaced Yan Dhanda in the 90th minute.
On 2 June 2020, De Boer signed a two-year contract with Eredivisie club ADO Den Haag, after his contract with Swansea had expired. He made his ADO league debut on 13 September 2020 in a 2âÂÂ0 away loss to Heracles Almelo.
After a disastrous season, in which ADO finished bottom of the league and suffered relegation to the Eerste Divisie, De Boer exercised a relegation option in his contract to leave the club as a free agent.
De Boer joined VVV-Venlo, who had suffered relegation alongside ADO, on 6 July 2021, signing a two-year contract with an option for an additional season. He was in the starting lineup on his debut for the club, a 2âÂÂ2 home draw on the opening day of the 2021âÂÂ22 season.
De Boer left VVV at the end of the 2022âÂÂ23 season, as his contract was not extended.
On 15 September 2023, De Boer officially joined Italian side Ternana on a free transfer, signing a one-year contract with the club, with an option for another season.
De Boer is a Netherlands youth international, having gained two caps at under-15 level. On 10 February 2015, he made his debut for the Netherlands U15 in a 1âÂÂ1 friendly draw against Serbia U15, providing the assist for Jurgen Ekkelenkamp's equalizer from his corner kick.