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.