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Andre Onana - Getty Images
Traces of the banned substance Furosemide were found in the Cameroon international's urine during an out-of-competition test on 30 October 2020, Ajax said in February, leading to a year-long ban for the player from all football activities.
A panel of CAS arbitrators in charge of the matter partially upheld the player's appeal and reduced his ban that commenced on 4 February, meaning he will now be eligible to play from 3 November.
Onana had said the violation was the result of a mistake, as he accidentally took a medicine meant for his girlfriend on the morning of 30 October.