[3] On 26 August 2020 it was confirmed, that Okkels had joined Swedish Allsvenskan club IF Elfsborg on a deal until the end of 2024.

On 30 January 2024, Okkels joined Dutch Eredivisie club FC Utrecht on a deal until the end of June 2027.

[5] On 13 August 2024, Okkels signed for EFL Championship club Preston North End on a three-year deal for an undisclosed fee.

[6] On August 17, 2024, Okkels made his official debut in a league match against Swansea City when he came on in the 64th minute to replace Ryan Ledson.

On January 6, 2025, in search of more playing time, it was confirmed that Okkels joined Scottish club Aberdeen on a season-long loan deal.