Kenwyne Jones is fighting Stoke City over an £80,000 fine after attending a disciplinary hearing at his former club on Wednesday.
Jones has contested his punishment from January, when he was docked two week's wages for failing to report for the Premier League game against Liverpool, and was at Stoke's Clayton Wood training ground yesterday.
The 29-year-old left Stoke for Cardiff in January in a swap deal involving Peter Odemwingie but is still unhappy with the fine and has appealed through the Professional Footballers Association.
Jones has claimed there were personal reasons behind his decision to make himself unavailable for the home game against Liverpool, a move which infuriated manager Mark Hughes after he was notified by text message the night before the match.
The hearing was led by chairman Peter Coates and included Jones, his agent, and PFA representative Simon Barker.
Stoke now have 10 days to consider the appeal and will either stand by the punishment or reduce the fine.
Jones could take the matter to the Premier League if he is still unsatisfied with the outcome.
The Trinidad & Tobago international has scored one goal in eight appearances since moving to South Wales.