Never put the wrong guy on sale ? Or had an injury after you put someone on sale ?
There is reasons where you might not want a guy to be sold in the end.
Actually, I never accidentally listed my player, but two times I accidentally bid on my players. You can see two gray transfers in my history.
Especially irritating, because of the new taxes. I'll have to wait until the end of the season to transfer list my guy again.
(Yes, I enabled that pop us screen, after the mentioned incident)