Trainer Gerard Butler has lodged an appeal against his five-year ban from the British Horseracing Association.
The Irishman, 47, was suspended on December 4 after he was found guilty of using illegal steroids on nine horses at his Newmarket stables.
However, Butler claimed that he was assured by vets that the product was legal in curing injured joints.
The BHA tweeted: "Gerard Butler has appealed against the findings of the Disciplinary Panel on 4 Dec 2013 and the penalties imposed upon him.
"Butler was disqualified for five years after admitting seven breaches of the Rules of Racing.
"No date for a hearing has yet been set. Butler will remain a disqualified person in the meantime."
Butler's ban is due to expire in 2018.