Cancelling transfer

I sold one of my top players by accident.. I actually wanted to get him some treatment but as I was selling some other players before that I automatically did the same(tiredness I guess). This is maybe the best player in my squad and it would be really stupid to lose him like this. You may not be able to fix this now I guess, so I hope nobody buys him, but could this be possible in the future? There certainly are other managers who did such thing by accident or who regret doing it so it could be useful...

The option could maybe only be available when nobody has made a bid yet or within a certain amount of time after making the selling decision, to avoid unfairness because I wouldn't like bidding on a top player and then not getting him because the bid was cancelled so could you guys please think about this?!:(