I'd like to send my scouts out to search for a certain position, but at the same time to search for a player who can replace a current aging player.
For example if you are at Man U, you can tell your scouts to find a replacement for Ryan Giggs, doesnt matter where he comes from, just find someone.
This instruction can also be changed to suit what you want. Say if you want Giggs replaced now, you tell your scout to find a near if not better player. But if you think Giggs has got a few more years left, you can tell the scout to find an eventual replacement for Giggs.
This can also be used by you to find your own "Giggs" if you manage a different team. "Okay, Alex wont sell Giggs, so i want you to go and find our own"