Early career De Bock joined
HO Kalken in his youth. After three years, the defender made the switch to the neighboring
Standaard Wetteren, where he was discovered at the age of 11 by scouts of KSC Lokeren. De Bock combined football with his studies at the top sports school in Ghent.
KSC Lokeren After coming through the
Lokeren youth set up, manager
Georges Leekens brought then 16-year-old De Bock to the first team squad. In the 2009–10 season, in the first match of the play-offs, De Bock made his debut at the highest level under manager
Emilio Ferrera. During the 2011–12 season he won the
Belgian Cup.
Club Brugge After being linked with Anderlecht, on 5 January, De Bock joined
Club Brugge, where he signed a contract until the end of the 2017 season, for a transfer fee of €3.5 million. He won the
Belgian Cup with Brugge during the 2014–15 season and followed this up by winning the
Belgian Pro League in the 2015–16 season and then the
Belgian Super Cup in 2016.
Leeds United On 11 January 2018, De Bock signed for
Championship club
Leeds United on a four-and-a-half-year contract. De Bock was handed the number 12 shirt. He made his debut for Leeds on 20 January 2018 in a dramatic 4–3 loss against
Millwall. De Bock featured in seven games, including having a 'tough game' against
Derby County, before losing his starting place to 19-year-old
Tom Pearce.
Loan to Oostende After falling behind left backs
Barry Douglas,
Leif Davis and
Tom Pearce in the pecking order under new head coach
Marcelo Bielsa for the start of the 2018–19 season, on 21 August 2018, De Bock joined
Belgian First Division A side
Oostende on a season-long loan. De Bock revealed that he had turned down a loan move to
Israeli Premier League side
Beitar Jerusalem F.C. to join
K.V. Oostende. In total, he made 20 appearances scoring 1 goal for K.V. Oostende in
Belgian First Division A.
Loan to Sunderland On 2 September 2019, De Bock signed for
Sunderland on a season-long loan. He made his
league debut for the club on 28 September in their 2–1 defeat of
Milton Keynes Dons.
Loan to ADO Den Haag On 13 January 2020, De Bock joined
Eredivisie club
ADO Den Haag on loan until the end of the season.
Loan to Zulte Waregem He joined
Zulte Waregem on a season-long loan in July 2020. He subsequently rejoined Zulte Waregem on a fresh season-long loan agreement in July 2021. Having not made an appearance for Leeds since January 2018, De Bock's time with the Yorkshire club concluded in June 2022 with the end of his contract.
Zulte Waregem It was announced on 20 May 2022 that De Bock had signed a permanent 1-year deal for the 2022–23 season with Zulte Waregem, with the option of a further year. ==International career==