Confirmations should be asked
I strongly suggest a confirmation to be displayed before selling a player through a negotiation offer. I just accidentally sold my best goalkeeper by a very low fee, just because my app got a little slow and my thumb slid on the ACCEPT button. This is very frustrating, as I had been weeks training him, and I'm not sure if I will be able to buy him back.
Please consider adding this feature, so no other training has this problem again in the future.
Just to make it more clear, this happened while playing through the android app.