Charlton have launched a strong protest to the Football Association after losing their appeal over Lloyd Sam's red card in Tuesday's 2-1 win at Hull.
Sam was dismissed after clashing with Hull's Ian Ashbee
Sam is serving a three-game ban for his clash with Hull's Ian Ashbee.
In a letter to the FA, Addicks chief executive Peter Varney said: "We only received a one-line response saying our appeal has been dismissed."
"We have no idea who the panel are, what their qualifications are and which elements of our case they reject."
Varney added in Charlton's matchday programme: "At the risk of causing further upset in our relationship with the FA, we do intend to be vociferous about this refusal to introduce transparency into the process.
"Surely it's not too much to ask the FA to publish the reasons for the dismissal of appeals?"
Ashbee was also sent off in the incident, which sparked a brawl involving both teams, substitutes and coaches - for which both clubs have also been charged with misconduct by the FA.