I've been thinking for a while, and I'm not sure if this has been brought in recently because I haven't played in about 2 months...
But I'd like to see an option where you ask the player about a possible transfer.
For example, if Team A and B offer 20m for Player C. I'd like to ask C what he would prefer (what team to go to, or whether he'd like to stay at my club).
The importance of this is: it really annoys me when I have a great team and I think the players are happy and wouldn't want to leave. Then someone like Bayern Munich makes a bid, I say 'no' and the player gets disappointed. It'd be nice just to have a small sentence saying "would definitely like to move to Bayern", "would consider a move", "is uncertain" or "would prefer to stay".