The Spanish athlete, who has secured world medals in both the 1500m and 5000m, will remain banned from competing until 2028.

The Court of Arbitration for Sport has dismissed an appeal from Mohamed Katir against his four-year ban for tampering.

Katir, who was hit with a four-year ban last December after a disciplinary tribunal ruled that he had committed the anti-doping violation, filed an appeal to CAS.

The 27-year-old had already accepted a two-year ban for three whereabouts failures in 12 months. He also admitted he falsified a boarding pass to make it look like he was travelling on the day of one of the whereabouts failures. However, Katir did not accept the additional consequences (i.e. a four-year ban) of that violation.

World Athletics also filed an appeal to CAS in January this year, with the aim of getting the ban extended to five years.

However, CAS has dismissed both Katir's appeal and World Athletics' counter-appeal.

They determined that Katir committed the violation for tampering of written documents he’d submitted as evidence.

The panel also judged that there was “no aggravated circumstances to justify an increase to the period of ineligibility of four years”.

Katir's two-year ban (whereabouts failures) and four-year ban (tampering) will run concurrently, meaning he will remain banned until February 2028.