A mistake to not speak. I appreciate what
@Ric is saying about commenting on ongoing legal matters but given this is a tribunal (ie no jury) and the clubs agreed to make their appeal documents from last November public, there must be something they can say without effecting the next appeal or future court cases. Something beyond "The attempt to tarnish the reputation of the club is clear and obvious" etc.
If they don't say anything, you don't come off as dignified or obeying the due process of courts, you look guilty and there's X number of radio hours and column inches to fill - if they're not talking about or discussing what we're saying, they'll be talking about what UEFA is leaking.